Hey there Tore,
Yes, some times this happens - I know. I few versions back I even described it in the releas notes as something which is hard to solve. This is since the "fast volume change" was introduced, thus already quite a while back by now.
It depends on "something" you/we did before maybe even related to the fresh restarting of the sound engine (XXEngine3), like after a reboot.
It may also be related to how "decently" you select the current track. I mean, you can see that when more than one (Volume Normalized) album is in the Playlist Area and Volume Normalization is On, some times you see the Volume (left hand pane) change when you again click the track which was already selected. I think that situation would have gone wrong like you describe, when you had not clicked that track again. It (kind of ?) would have used the Volume you see (at virtual first), while once it plays and you change the Volume, it related to that internal setting you can't see and then it jumps relative to that internal setting.
I always have the feeling that this can happen once per day only, and then in the first album I play ...
Regards,
Peter