I've found three payments (49.5, 49.005 and 49.5):
[2018-01-11 18:39:19.686] [INFO] [default] - Payments emark { NdQvWQ94gJgGBbXmJmLGGG4Y7XPm5pma2d: 49.5 }
[2018-01-11 18:40:19.769] [INFO] [default] - Payments emark { NdQvWQ94gJgGBbXmJmLGGG4Y7XPm5pma2d: 49.005 }
[2018-01-11 19:59:20.440] [INFO] [default] - Payments emark { NdQvWQ94gJgGBbXmJmLGGG4Y7XPm5pma2d: 49.5 }
They do seem to correspond with the date/time you've posted your message.
I've taken a deeper dive, because when using the public explorer, I couldn't match two of those transactions, and I've uncovered the following txns:
"025847819aee4d2fad463b964e2b6d5812dd8464186fc7f8153ec5f68b7db842" -> 36.36061600, 11th of Jan, 2018
"a265dd53718479025c3d642fc728f522c8f2a1535b009d4d5abfa10e515e9afd" -> 49.5, 11th of Jan 2018
"463649d806d5639efc23cbdb49dc9af9ae895969573514faec5452ce1101e2da" -> 49.5, 11th of Jan 2018
"8168af95a5b96f2768c8e038d02c93ba93577b0f20ba77636587f010421fbb26" -> 5.20249100, 4th of Feb 2018
These total to 140.563107, which is 8 DEM short of the expected 148.5 for three blocks. If you take a quick look at the first and the last TX ID above, you'll see what went wrong - since a PPLNS-based system is being operated, essentially some of the blocks you mined were partially allocated to miners who previously mined but didn't manage to find a block. Over time, this averages out nicely and tends to be fair, but since there aren't always any miners active on my pool, it can get slightly skewed. I have sent 10 DEM (TXID 3746fb2a34f59aa2c74655f76c0ba06e6a3587ec87d4db9bb05a0b59d5270151) to the address you've specified to make up the difference for this skew.
Let me know if there's anything else!
Y.