BPM start while it should not

Hello,

I'm facing a strange situation : a BPM starts if a new email is added to the case and if its direction is anything other than "outbound"



But, strangly, the BMP will activate with any email added, no matter the criteria i indicated.
For example, all these emails below have activated the BMP, whereas these are clearly outbound.




anything wrong ? Or is it a bug ?

Thanks