Speed on climbs, Wahoo Snap

So I have an issue with speed on climbs. I read the same power from my wahoo utility vs. Zwfit. But my speed on climbs is 5-7 mph faster on wahoo. The Zwift speed is not realistic. It reads no more than 6-7 mph on Zwift and is often times below 5mph. All software is up to date, and everything is recently calibrated. Any thoughts?

I don’t see a problem, it’s seems to be reading correct. Do not try to compare what the Wahoo app speed says to Zwift. Zwift is a virtual world with hills and there is no way for the Wahoo app to know this.