Try to resync your wallet
Wallet re-sync
If you need to resync the wallet, run the following commands as root:
CROPUSER=cropcoin #replace cropcoin with the MN username you want to resync
systemctl stop $CROPUSER
rm -r /home/$CROPUSER/.cropcoin/{banlist.dat,blk0001.dat,database,db.log,mncache.dat,peers.dat,smsgDB,smsg.ini,txleveldb}
systemctl start $CROPUSER