Try the following to help debug it further. WPT is a pain when the ace in hole fails.

1) Check the resistance of the mini-coil that releases the bars. It should be around 5.5 ohms. If it is around 14 ohms then you have the original and need to get a replacement. This will make sure the mini-coil properly releases the bar (in some cases the original mini-coil had too much resistance and wasn't effectively releasing the bar).

2) Unplug the AitH main coil (the one that raises the bars) and then test the bar release mini-coil to make sure it drops.
3) Plug the main coil back in and then unplug the bar release coil and test the main coil to make sure it raises the bars.
4) If those work just fine separately. Try them when both are plugged in. If something doesn't work then, it could be some short that is causing the main coil to fire a split second after the release coil fires.