In addition to the info throwaway403 provided, the practical step you need to know is - at the login screen you can choose between wayland and x11 (although most people never notice the option),
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reboot your machine, or just logout
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on the standard version 22 cinnamon login screen you should see a little picture of a mountain in a circle click on that and it will give you a couple of options (cinnamon default, cinnamon software rendering, cinnamon on wayland)
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choose one of the three you're not currently using and then login
Try the other options if that doesn't fix it. If none of them fix it then it prob isnt an X11/wayland issue
Note where you choose the x11 vs wayland changes depending on which display manager you're using and whether you've installed any themes - so if it doesn't look as described then click on stuff on the login screen until you find it - the only other things will be accessibility options and virtual keyboards unless you've installed something really left field