If it's dolphinbar, In my experience it's a bug that occurs on some PCs that they couldn't replicate and fix. I ended up using a dongle and a usb ir bar for that PC while my laptop used the dolphinbar.
If you are still having issues, install JoytoKey https://joytokey.net/en/
JoytoKey maps your controller buttons to keyboard buttons. It is not preferred, but you can map your Wiimote 'A' button to the 'A' on the keyboard, and the 'A' on the keyboard to Dolphin