I checked and I didn't find any problem with a ball bouncing twice, either offline or online.
I found a problem when the ball was close of the line (or was going to be close), which would lead to wrong scoring. I fixed that in the just released Build 65.
If you see wrong scoring again, let me know ..!
Also, the "Z" button doesn't work without additional settings ; you have to remap the strikes to make it work. (but the different mini-updates of yesterday have been quite messy, so not sure which one u got, it may have been one where nothing worked correctly...