There is nothing odd about this. A common surface is to take the ball to 500 then 1000 then add polish or 500/2000 and add polish. You generally want some deeper groves in the ball when applying surface to the ball. otherwise the polish just fills the grooves and you end up with no surface at all. Something I have worked with is also using the above and very lightly hitting the ball by hand or on a spinner for a few seconds with a 2000 pad to just nock a little of the polish back off.
Most of the balls you see listed even is it says 3000 polish doesn't mean they hit it with a 3000 pad then polish it. There are steps they go through to get there.
Bowl1820 has posted some great tables for different surfacing on bowling balls and how to apply them that you can search.
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