it could be from the ball return cause same thing happened to my bowling balls way off my track and my track gose right between some of them on my black widow and on my freeze which i just got at christmas already has lots of scratched from the ball return cause it could be moving past a nail which will mark up your ball abit and as soon as you see it tell the machanic and they will goo and check cause ik this cause my ball came back with a nail in the thumb hole.
hope this helps its normaly just nothing jsut the ball return but it wont affect your ball unless there a as your say grooves on your oil track then you will have to adjust your hand abit to get it off that line
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