Hi,
If you are using a BICS connection, once all the changes are done in Bw side, regenerate the query using RSRT. Check the result and ensure everything is fine as expected.
Go the corresponding webi of that Bex query, go to edit -> Change source option and point your webi again to the same bex query and refresh. Hope that should solve your problem.
If that don't work again, then you might have to create a new webi on top of that Bex query.
BR
Prabhith