This is a strange little bug.
I installed the latest 3.0.5929 on a clean 2.5 portable installation, on a W10 tablet with 125% display setting.
When I for example set 'repeat 1' while a track is playing, , and then select another track to play, the repeat setting switches to 'repeat all'.
When I then set it e.g. to 'repeat none', and skip to another track, the setting switches to 'repeat 1'. Etc.
So somehow after having changed the repeat setting, when as a next step you skip a track, that simultaneously toggles the repeat switch.
I checked, and that does not happen on my desktop computer setup, only on my tablet.
And a minor observation on something that has been the case for as long as I remember, after a clean install, MB has 'repeat all' as default status. Not 'repeat none' as I would expect.