I have two servers with the same SQL sync, however when setting character data, using money, etc. then switching servers, the changes do not appear there if you've already loaded onto that server before

This allows various dupes and exploits.

No idea on a fix yet, but what I think is occuring is the server is keeping a cached version of the character/data in memory, then the other server operates on its own cached version OR SQL version. Unconfirmed, totally speculation.