I remember this happening to me, I can't quite remember why.
I think it may have been because I switched to the bigger fuel and timing maps instead of the stock ones or because I changed the rpm and load values in the axes of my map.
But honestly I don't find the evoscan GUI useful for tuning at all, I much prefer to look at the data in excel. I just filter for throttle positions >85% to find my WOT pulls, then all the data I need is there including AFR, timing, boost, WGDC etc.