i created a Experience fragment in Target and applied changes to my experience. I am not able to see my changes in QA link, but i can see my changes when i try to edit in editor.
Open your QA link in the Incognito window (please close all other Incognito windows / tabs before). If this does not work - I would recommend to regenerate the QA link (depending on what you change in the activity you may have to regenerate it).