The other day I started my (2019 f150 3.3l) cranked the max a/c and max cold on the dial the a/c blew hard then cut to super soft then back to hard then back to soft then back to hard once I got on the highway it stayed back to full hard blowing max A/c I’m just wondering why did it do this? , what did this ? What should I look at or fix? Ac was still cold but it was really weird.

all ac lights on switches stayed lit.