So now the block height is back to normal and wallet seems fine so what happened? Is this developer caused?
No, it is still abnormal... you might just not have a sour node connected. Whoever is playing with the modified chain (since it is still growing), has to connect to the real chain, through at-least one node. (Seems that connection is still in my list, as I still have the "0 hours remaining", and "Processed 43441 of 551304 remaining", on my running wallet.)

[
{
"addr" : "5.250.177.28:1631",
"services" : "00000003",
"lastsend" : 1397800353,
"lastrecv" : 1397800371,
"bytessent" : 202520,
"bytesrecv" : 206510,
"blocksrequested" : 29,
"conntime" : 1397769003,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : false,
"startingheight" : 43165,
"banscore" : 0,
"syncnode" : true
},
{
"addr" : "98.126.98.138:1631",
"services" : "00000003",
"lastsend" : 1397800374,
"lastrecv" : 1397800364,
"bytessent" : 163104,
"bytesrecv" : 274894,
"blocksrequested" : 29,
"conntime" : 1397769003,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : false,
"startingheight" : 43165,
"banscore" : 0
},
{
"addr" : "188.165.194.96:1631",
"services" : "00000003",
"lastsend" : 1397800377,
"lastrecv" : 1397800381,
"bytessent" : 213321,
"bytesrecv" : 219779,
"blocksrequested" : 29,
"conntime" : 1397769004,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : false,
"startingheight" : 43165,
"banscore" : 0
},
{
"addr" : "188.226.182.21:1631",
"services" : "00000003",
"lastsend" : 1397800376,
"lastrecv" : 1397800360,
"bytessent" : 210565,
"bytesrecv" : 214647,
"blocksrequested" : 29,
"conntime" : 1397769008,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : false,
"startingheight" : 43165,
"banscore" : 0
},
{
"addr" : "75.151.232.141:1631",
"services" : "00000003",
"lastsend" : 1397800374,
"lastrecv" : 1397800364,
"bytessent" : 103730,
"bytesrecv" : 243033,
"blocksrequested" : 29,
"conntime" : 1397769044,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : false,
"startingheight" : 43165,
"banscore" : 0
},
{
"addr" : "54.186.33.252:1631",
"services" : "00000003",
"lastsend" : 1397800351,
"lastrecv" : 1397800352,
"bytessent" : 144853,
"bytesrecv" : 215697,
"blocksrequested" : 25,
"conntime" : 1397776240,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : false,
"startingheight" : 43215,
"banscore" : 0
},
{
"addr" : "[2001:0:5ef5:79fd:24ac:3403:8354:8ef2]:60076",
"services" : "00000003",
"lastsend" : 1397800372,
"lastrecv" : 1397800352,
"bytessent" : 184392,
"bytesrecv" : 106075,
"blocksrequested" : 24,
"conntime" : 1397777200,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : true,
"startingheight" : 43220,
"banscore" : 0
},
{
"addr" : "[2001:0:9d38:6ab8:1888:3d3f:bbc4:8cf6]:49846",
"services" : "00000003",
"lastsend" : 1397800372,
"lastrecv" : 1397800377,
"bytessent" : 126782,
"bytesrecv" : 99758,
"blocksrequested" : 16,
"conntime" : 1397788927,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : true,
"startingheight" : 43315,
"banscore" : 0
},
{
"addr" : "[2001:0:9d38:6abd:243e:110a:e7f3:dcb6]:53490",
"services" : "00000003",
"lastsend" : 1397800365,
"lastrecv" : 1397800383,
"bytessent" : 136302,
"bytesrecv" : 69028,
"blocksrequested" : 13,
"conntime" : 1397791074,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : true,
"startingheight" : 43345,
"banscore" : 0
},
{
"addr" : "[2001:0:9d38:6abd:899:3392:b2e8:73c]:54849",
"services" : "00000003",
"lastsend" : 1397800363,
"lastrecv" : 1397800373,
"bytessent" : 102452,
"bytesrecv" : 43760,
"blocksrequested" : 7,
"conntime" : 1397795191,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : true,
"startingheight" : 43390,
"banscore" : 0
},
{
"addr" : "[2001:0:5ef5:79fd:c80:136e:9d28:710c]:57797",
"services" : "00000003",
"lastsend" : 1397800360,
"lastrecv" : 1397800356,
"bytessent" : 79666,
"bytesrecv" : 6326,
"blocksrequested" : 2,
"conntime" : 1397799540,
"version" : 70002,
"subver" : "/Satoshi2:0.8.6.2/",
"inbound" : true,
"startingheight" : 43433,
"banscore" : 0
},
{
"addr" : "50.245.223.30:9333",
"services" : "00000003",
"lastsend" : 1397800385,
"lastrecv" : 1397800381,
"bytessent" : 1918,
"bytesrecv" : 82742,
"blocksrequested" : 0,
"conntime" : 1397800184,
"version" : 70002,
"subver" : "/Satoshi:0.8.6.2/",
"inbound" : false,
"startingheight" : 551308,
"banscore" : 0
},
{
"addr" : "[2001:0:9d38:6abd:301c:f65:8ea6:77f9]:9333",
"services" : "00000001",
"lastsend" : 1397800369,
"lastrecv" : 1397800319,
"bytessent" : 731,
"bytesrecv" : 43622,
"blocksrequested" : 0,
"conntime" : 1397800191,
"version" : 70002,
"subver" : "/Satoshi:0.8.5.1/",
"inbound" : false,
"startingheight" : 551308,
"banscore" : 0
}
]
P.S. A "banuser" would be a nice feature, in a time like this...
Observe...
CORRECT:"subver" : "/
Satoshi2:0.8.6.2/",
"startingheight" :
43165INCORRECT:"subver" : "/
Satoshi:0.8.5.1/",
"startingheight" :
551308