Constant Multiplayer Desync

[Qibli Turtle]

My friend and I have been running multiplayer campaigns in immortal empires for years now, and we've never had any issues with desyncs. Starting just this morning, a campaign we started last night began having constant desyncs upon the initiation of a battle. Not even loading into a battle, simply the battle options screen that shows auto-resolve, attack, and retreat, and we get an endless loop of desyncs, with no amount of reloading will fix. Believe me, we tried reloading for about half an hour on end, to no avail. Is anyone else having this issue? Has anyone found a way to fix this? Or is this a server side thing?
Edit: After some debugging, we found it was simply an issue with a recently updated mod. If anyone else is having this issue, see if you have Assladders Begone or Run 'em Down enabled. It seems that the recent mod updates broke something for multiplayer.