Default CM11 and Bluetooth

Bluetooth is very weird on CM11. I have one device (Motorola H730) which would auto connect when I turn it on. But on this other bluetooth device (Flexsmart X3) would not auto connect. I have to remove it from my phone and re-add every time I want to use Flexsmart X3. Anyone know why this is happening? Both devices works fine on my old android phone.