SLA is set as follows

Priority Medium - 4 hours

Priority Low - 8 hours

 

Create a call in PM an save it.  Edit the call and change the priority to PL the call breaches SLA immediately.  Also the "Due By" date & time field gets erased.  Why would this happen?  There are no issues if creating a call in PL and changing it to PM.  Any help is appreciated.

 

 

Thanks