More than one keyboard layout is causing errors on Manjaro KDE

I originally had a Colemak layout as my main keyboard in Manjaro KDE, though keyboard layouts in settings. Later I added a Russian layout as secondary keyboard layout, and some of the “colemak” keys (in other words, the non-standard keys like f - r - s - t) were in English, instead of the Russian characters like they should be.

So I just removed all the layouts and set up a single US keyboard layout, but those same keys don’t output anything now. If I go back to Colemak, it works like it should.

If I do it manually with setxkbmap -layout us or setxkbmap -layout ru in the command line then it works fine.

I have the same issues with other layouts, like Spanish or whatever. I just want a second keyboard in another language that works automatically on startup. Any suggestions on how to fix this short of reinstalling Manjaro?