Multi sensor opened 40 times?

Anyone have problems with false alarms on your multi sensors? I just installed 4 multi sensors and one of them has given me false alarms in the past 2 days. Both times were in the morning, this morning it opened and closed 40 times over the course of 2 hours and it was a similar situation yesterday.

Now I’m not saying it couldn’t be mounted incorrectly but I didn’t notice anything wrong when I installed it.

The multi sensor is mounted on a temporary construction door that is currently boarded shut.

Is it likely that the multi is defective? Or it’s improperly mounted?