All of my best runs have been deleted

If you're intending to reinstall your game, your saves will usually be wiped out. That's why you should go to the games directory and search for "sins2_save" files if you installed it via steam. If you did install the game via steam, then your saves will be in the steamapps directory. You can copy the saves to a different storage device and then you can preserve your saves if you are trying to reinstall your game.

Also, this game is still in development so each major update will generally mean that your game saves will be wiped out as they are no longer compatible with new updated versions of the game, so if you want to finish playing your older saves, right click the game on steam, go to Updates, and then switch Automatic Updates to "Only update this game when I launch it". Then turn your internet off or go in offline mode on steam, so the game isn't grabbing the updates and you can finish playing your saves.

thank you for the response.  The saves themselves are not the problem i know about the saves. Its the best run stat that is effected. When i load the game on a different pc it will say i haven't beaten any missions. Also if i beat a mission on pc2 and go back to pc1 it doesn't show the win there either. Hard to keep track of witch ones iv played and witch difficulty.

Hello! Double checking to make sure if you have steam cloud enabled? I think that may be necessary for things to carry between different pcs

I have steam cloud enabled and can see saves from the other pc from in progress games the only thing that doesn't transfer is the badges next to the missions iv completed