Since you say it's not very noticable, it's likely you were doing it at your other house also. This other houses lanes might be a on little more solid foundation and don't give as much as your other house so you notice it more on them.
The double dribble is because you are releasing the ball into the lane , not on to it. Most loikely because your releasing a little early and/or you may need to be alittle lower.
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