Odd unnamed .zip file being created causing Cache issues

I Have a server that I run and When ever myself or others log into the server, we find this random .zip file with no name being generated and put into our multiplayer mods folder, and when looking into this zip folder, its saving cached data for our map, which is causing an issue when we update our map and this zip folder is making it load the new changes and the old versions doubling up the map. we didn’t add this file into the servers mods list, we don’t know whats going on with it nor how to remove it.