I am seeing this too on a flight YEG-IAH next may, seat map says its a Boeing 737-700, but only they 8 F seats show up, 7,8,9,10,11,12,14,20,21 are E,+ and 22-31 are E-
if this is for sure chaning I say booooo on UA, I always routed my flights through IAH as its the only mainline service from YEG........