Aukey ep-t25 do not turn on/off when opening/closing the lid

Pairing went ok but then the t25 stay always on.
To turn off I need to touch them for 6 seconds but then they don’t turn on opening the lid…they just stay turn off.

Damn, didn’t noticed the film over the buds contacts, now it works.
A little hint in the manual or a more visible film would be helpful.