What he said.What brand of holster are we talking about and what type of belt? Military or civvy or something in between?
Is it private purchase or issue, and did you have any other mounting options with it? Most if not all holsters I have come across have a belt loop for belt fitment. To me, a Molle option would indicate that it is NOT for belt fitment, e.g for chest plate/webbing, etc.
Just seems a bit odd (to me) that you have a Molle option for belt rig as the presumed hard plastic of the Molle would not be comfortable as a waist belt.