Any possibility the old waterpump/pulley had a flange at the side of the pulley to limit the belt's movement, or a tightener did and something is now different in those areas?
Another cause could be there's something wrong with the waterpump and it's shaft isn't EXACTLY perpendicular to the mounting face or the edge of the pulley isn't exactly the same distance from the pump's mounting face. If the tightener was replaced, could it possibly not be "true" walking the belt to the side? Do you the old parts to compare/measure?
It's even POSSIBLE the new belt is defective/has broken cords/was damaged being pried into place, making it "walk" to the edge of the pulley rather than run "true" and stay in place.
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