It looks like the pulley on the V pump, the pulley on the mandrel and the belt are not a good match. Belt sits low on V pump side and high on the mandrel side, asking to throw it off.
3 photos and only one pic of the belt/pulley that is the problem. The picture that would help the most is a sideways picture of the vacuum pump pulley/mandrel pulley alignment.
Was a straight edge used, pulley to pulley during initial setup ?
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