@nuggets
It seems like something changed so that the system I used for randomization no longer works reliably enough from player to player. Unfortunately, I didn't find a satisfactory quick fix that reliably avoided desyncing and provided randomness automatically. I may do a more involved fix in the future. For now, I just uploaded a new version of the mod that uses a manually set seed instead. This should avoid the desyncing issue, but if you want to get a different set of random unit sizes, you'll need to change what the seed equals in Blueprints.lua, which is located in \mods\Resize All Units To Random Sizes\hook\lua\system
Note that if you are playing multiplayer, everyone in a game needs to manually set the same seed or it will desync (the seed is just equal to a number; so, you would just replace that number with a new number and save the file to change the seed).