data/persist/mapname.txt getting wiped every few server restarts

I posted this on the NutScript forums as well, but I figured I’d cross-post it here in case it’s a Gmod problem and not a NutScript problem.

Every few server restarts it seems that the game automatically wipes its own persist file for the map we’re playing on, rp_city14. Any idea what could be causing this? I noticed sometimes it only loads the gamemode data (spawns, map scene, dropped items, etc.) which is when it wipes the persist props. Sometimes the persist props spawn, but the game data doesn’t load in. It’s very rare that I get both - and when I do, by the time the next restart comes around either the map data doesn’t load or the map file gets wiped, or during the one after that. Any idea what could be causing this?