Strange Keyboard Shortcut behaviour

I am using the Mac OS 10.5+ keyboard keymap under Ubuntu 18.10 - to avoid confusion when using IntelliJ also on macOS. In custom properties I set

keymap.windows.as.meta=true

to activate the CMD key. When I type SHIFT-CMD-F (Find in Path...) or SHFT-CMD-R (Replace in Path...), IntelliJ prints an 'F' or 'R' at the cursor position in the currently open editor. This is really annoying because I always have to remember to double check before committing changes.

Has anybody seen this?

Thanks and regards,

Peter