How frequently have you searched the site for fares on this route? When prepping for an upcoming family vacation, I dummy-booked too many times and all of the sudden I started getting fares more than twice what I did before. I rectified it by deleting my cookies, using a VPN, not logging in, and using private/incognito mode. (I’m sure I didn’t need to do all of them, but don’t know which combination made it work, so I just did them all.