I have three BLU motion to control light and at the begin I had the same problem.
Reason because the light turn on instead you switched off it by the manual switch is because if the BLU detect you when just before you go out from the bathroom, when the BLU is not in the Blind Time frame, it keep the motion active for the time needed to reach again the blind time. So, when you turn off the light manually, the BLU turn ON it again because it has the motion still active.
I had the same problem but now I solved it in this way.
First: I created a scene using only the motion so, if motion is detected, turn on the light.
Second: I created a scene where if motion is not detected, turn off the light
Whit this two scenes, you don't have timer but light is ON for all the time the BLU detect motion.
To use the manual switch I created a scene where if the output of the device (1PM, 2PM ...) change to ON, disable scenes First and Second.
Then, I created another scene where if the output change to OFF, enable scenes First and Second
Hope my English and my explanation are clear.
Ciao