I would guess the 'g' in valgte is somewhat pronounced because you need to pronounce the 't' that follows. The reason I suggest 'somewhat' is that you need to stop the air flow to position the tongue for the 't' the result is a glottal stop (I think it's called) which has a small amount of sound associated with it.
Also in comparison to 'selge' (which can be pronounced either selGe or selle) according to my dictionary the infinitive 'velge' has the 'g' pronounced and does not have the option 'velle'.
Theory aside as our understanding of Norwegian develops we will begin to hear and notice sounds that elude us at the moment. Lykke til!