Progressive overload on Fitbod

Questions regarding progressive overload on Fitbod. My wife and I have been using Fitbod since July and there are a couple things about the app that are still unclear to me.

If I understand correctly, that 3 x 12 is the gold standard for increasing weight and my program is set to hypertrophy, why does my Fitbod very consistently have me doing three sets or even 4 sets of 15 or even 17 reps on an exercise?

Example: often barbell bend over row will have me doing three sets or even four sets of 15 reps at 130 pounds. Does this mean I should be doing 135 for three sets? And if so, why does the AI program it for higher Reps lower weight if 3 x 12 is pretty standard for increasing weight?

Also, if three sets of 12 reps is your benchmark for increasing weight, what about when the app has me doing four sets instead of three? Am I doing junk volume at that point?