Different Wiimote behaviour on connection attempt. 1+2 vs. SYNC

[mbc07]

An inconsistent NAND can cause all sorts of weird issues with BT Passthrough. If you're still having issues, despite using a recent development build and also using a real Wii BT Module, I would suggest backing up your current NAND and then starting again with a fresh NAND (basically rename User\Wii folder to something else, then open Dolphin and go to Tools => Perform Online Update => region matching the majority of your games -- this will generate a new Wii folder with a fresh NAND), then manually import back your save data from the old NAND to the fresh NAND...