Presets stopped working?

so, after three weeks of vacation, i wanted to play my preset game with my friends again… except it comes up with a unknown error when i load it.

all my presets have this issue… no matter which one i load, be it a workshop game or not… to make it weirder, trying to change the available characters, maps, or gamemode as such pops up the message ‘no X selected’ as if none have been selected, even when they are.

EDIT: here are two images to illustrate the problem:

https: // imgur. com /a/ 748amA3 (remove the spaces)

in one, the error message is visible, the other shows a image of the map selector. switching only one map off triggers the message. it clearly shows that all but one maps are selected, yet it complains none are.

i already confirmed that its not my workshop code. i had a small preset with only one rule, and the glitchy state remained after removing the code… furthermore, opening one of the official presets and pasting my code into it shows that it works normally and without issue.