If you go to
https://twitter.com/SuprnovaPools , it says what the problem is. "$BTG Pool is still syncing as @bitcoingold didn't release any bootstrap nor fast nodes to sync from." This might have been done on purpose.
This is my thought as well.
I just lost some more respect for the BTG developers, as it wasn't enough for them to pre-mine, but now since they are the only ones with a currently synced blockchain I am sure they are taking advantage to insta-mine as many more blocks as they can for personal gain. Pretty crappy way to set the tone for a launch.
They have been doing this from the beginning. Theese couple hours mean nothing.