Yep, mine does the same thing.
Also something else about percent of power reading on your Dynon EMS you may not be aware of. The percent of power calculation is made by Dynon using the RPM red line value you set in the EMS. Dynon assumes the red line value is the RPM at which the engine generates full power which for our engines is 2700. Now, if you have a Sensenich prop that has a 2600 RPM limit and you set you EMS for a 2600 RPM red line limit in order to get EMS warnings when you approach or hit the prop limit, then your percent power display values will not be as accurate as they could be. I have my red line set to 2600 and I think that affects the percent power reading by about 2 percent. That is, when my percent power reading indicates 77 percent power I am actually generating 75 percent power. Not a big difference but something you should be aware of.
Just noticed from your web site you dont have a metal Sensenich 2 bladed prop so you dont have the 2600 RPM limitation.