I moved the problematic coil to different position then the DM picked the coil correctly.

Replaced the coil with a new one then the problem was gone.

I found the coil was not completely gone but it varied its secondary resistence along with the temperature. The coil was original with a blue sticker on it.

The good news is this fix fixed the other problem I posted years ago. The post # is 160385 (Where does this strange noise come from?).

Thanks Arthur.