Netplay for pc. gameplay sinc issue?

So I had no problem connecting at all ,everything worked perfectly. The problem that I did run into was that when my brother and I were playing secret of mana, he would be attacking enemies that I could not see and vise-versa. Has anyone had any issues similar to this and if so , did you find a solution? The games do not seem to be syncing data properly.

thanks in advance.

Which core were you using? I’ve played for a pretty long time without desyncs using snes9x (non-next), but that was a pretty long time ago. Something may have gone sour since then.