Hi DW,
I apologize in advance that this post might be a little vague.
But i have experienced on some of our newer swift solutions that when you are logged in and go to the checkout delivery info and user info (Email and Phonenumber) disappears sometimes, and it doesn't update when you want to edit your information from the checkout. I find it very hard to explain what is going on, it just seems super unstable. And it causes issue where if the delivery adress is gone on your attempt to check out it wont let you.
I have tried to take a video from a Standard Swift Solution on 1.22 http://twodayco3.swift.dwdemo.dynamicweb-cms.com/
Video Link: https://vimeo.com/842136825?share=copy
I have yet to actually figure out what is happening, and i hope that you might be able to get an idea of what is happening from my video.
Kind Regards
Martin