Weird scroll behavior in some apps in Fedora 34

I have a serious problem with my Fedora 34 installation. It seems to do certain random events. Few examples:

  • If I click on a tab in Chrome, it will scroll along the tabs (basically switching to the tab on the left, until I move mouse off the tab bar). Firefox doesn’t have that problem.
  • if I hold Ctrl Key with an active prompt in Terminator shell, it will keep enlarging the font (like Ctrl+mouse wheel). The default Terminal app doesn’t do that.
  • similarly, holding down Shift seems to scroll the terminal up (in Terminator)

Pressing Shift (in Terminator) also brings

It seems to be similar to this (, but changing mouse and keyboard did not help + they work on other computers around the house.

I believe this has started around when I upgraded from Fedora 33 to 34, no hardware changes aside from adding an additional SSD in the meantime.

Does anybody have similar experience? What could I look into, to try and find the problem?

Journalctl, dmesg don’t seem to see anything out of the ordinary (apart from the usual problems).