With the minimal information you gave, it's pretty hard to identify a solution in your specific case.
Most 2 handed (assuming no thumb) bowlers tend to throw the ball with very little axis tilt, and that could be placing the fingers directly on the track area.
Since you're also having the problem with it on your spare ball, and I'm assuming your spare ball is something that doesn't flare, it's hitting the fingers right away.
If all of the above is true, you need to develop some axis tilt to get off of the fingers.
I would investigate other 2 handers and see if they have had the same problem, and how they solved it.
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