Epix Pro (51mm): Total Ascent (Climb) way out!

Hi All - I have owned the Epix Gen 2 (47mm) and now the Epix Pro (51mm). Both these watches after a ride have the total ascent (climbing) value MUCH higher than everyone else in the group. I also do my rides with an Edge 1030 and my Edge Total Ascent is very much in line with everyone else in the group. The Epix though is about 20% more than the rest. Example: Did a 98km event ride yesterday. Total Climb was around 1300m (that was pre-measured and Edge1030 was close to this). My Epix pro showed 1505m. Anyone else also seeing this?