@soumyarani
Can you share the activity url and show us what should we expect from experience B in order to confirm if changes are coming on page or not ?
When you activate the activity, what is traffic split percentage for Experience A and Experience B ?
Can you test by setting the 100% traffic to experience B only and 0% to experience A ?
If still you do not see the changes from Experience B then check the below steps to further troubleshoot this.
Did you check the response of Target call in network tab?
You can check this as :
Developers tool in browser -> network tab -> filter with 'tt.omtr' -> click on the request ->go to response tab and you should the see the content from either experience A or Experience B