Quoted from Thanos75:
I have been noticing that after the Sparky magnet catches a ball and holds it that sometimes the ball sticks after the magnet is released. It doesn't happen everytime and when it does it just takes a shake or another ball hitting it to knock it loose. Could one of the balls have become magnetized? Also I tried... Alone....to install those Blade graphics. One went on pretty good the other I made a total disaster with. I just have a pro so I don't have those fancy table legs and I couldn't find a good position for the playfield to get a good alignment on those. I will remove and try again and this time with help.
Are you sure that your magnet is level or ever so slightly raised so it's not allowing a stationary ball to get trapped at the edge of the hole?