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The real fdroid is not malware. Did you get it from f-droid.org?
The vendor’s software may be spyware and not like you using something other than the stock keyboard. Though it may just be poorly written software which conflicts. Could be many things.
There is also a setting under accessibility to turn off animations (at least on my phone–a Pixel 4a w/5g). It is in the color and motion section.