Multiple Phone Calls Different Person

My team rotates an on-call phone every week.  We consist of five employees with only one on-call at a time using a company phone.  When an incident requires notification, the on-call person will get up to three phone calls - one for them and one or two for other people on the team.  The schedule is built in xMatters to show only one person on-call at a time.  When not on-call, the other team members are not signed into xMatters. 

So, using myself as an example:

Call #1: The automation will say it is for one of the other team members.
Call #2: The automation will say the call is for me.
Call #3 (If it happens) The automation will say the call is for another team member - but not the same one as call #1.

I have tried multiple changes to all team member device profiles with no luck.  The profiles are set up to alert through the app first.  Wait 60 seconds and call the on-call phone and alert through email as well. 

Is anyone experiencing anything like this or have experienced something similar?

Thank you,
Nick