I can only compare the given block explorers (gridcoinstats.eu, gridcoin.network, nuad.de).

gridcoinstats.eu and nuad.de are on the same fork with 0.0x difficulty and same block number.
gridcoin.network has currently a difficulty of 0.5 and a higher block number.

I was on the same chain as gridncoinstats/nuad.
They've forked at block 1164835.
The last equal block hash was with 1164834.
After a reorganize, my wallet is now in sync with the longest chain.

Seems that I have to share some... :D

Please use the following command in your wallet console if you're on the 0.0x chain which reorganizes your wallet from 1164834:

reorganize 93379e4d25321be2f24df4ae57c9746a3183cd7d184f825808616824411a329e