I've seen that happen, like during the code part in the party mode, for some reason, certain sections when you click on them delete the mod menu and you have to restart the game to get it back.
maybe you mean this? https://oldsportgames.itch.io/bbmm/devlog/449399/fixed-a-small-bug
eh, kind of, although when you press character modifiers during the glitched part in party style, it just disappears