F-Droid suggests updates to architecture-incompatible apks

After having installed the x86 apk of the Firefox browser on my Moto XT-890, when there is a new browser release, f-droid suggests an update to the ARM apk, which is built for an incompatible architecture. The same happens, when I install the x86 version of, for example, VLC. It wants to update from 0.9.7.1 (x86) to 0.9.7.1 (ARM).