Had the same problem with my Vitoria Corsa 32, had never had any issue like this fitting tires before.
Went down to my LBS, his first question was if I actually had the correct size for the rim.
5min later they were fitted on the bike, fingers crossed for no flats.
I get to this point repeatedly, it's unbelievably tight, won't even make it the brake track
The rim is a kinlin 38mm alloy rim
25c Vittoria control g2