Permission to Install Apps from F-Droid on LineageOS 16

Hi, I’ve installed F-Droid in a fresh LineageOS 16.
Always when I try to install a app from F-Droid, I been lead to the dialog for allowing install from untrusted sources. But it’s set to ON, and after return to the install screen, the install will terminated.
How can I fix this?

Do you have any overlay/draw-over-apps app installed like Twilight, Redshift, CFLumen etc?


For the moment, I’m only able to install apps by downloading the apk from fdroid and then install it via file browser.