This happend to me when I tried to install WaveUp through F-Droid. Later I noticed that the icon of WaveUp in the F-Droid list wasn’t showing the normal app picture.
I would suggest that you remove the app F-Droid.
Is it possible with the browser on the phone to go the website of F-Droid and download F-Droid from it directly on your phone? And check then in the app F-Droid if there are updates before anything else.
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