Strange behavior with iPhone 15 Pro Max after adding a second eSIM to my phone.

Not sure if this is an iPhone problem or a US Mobile problem.

Since I added a second US Mobile line to my phone as a backup line, when I get calls on my phone to my main phone number, it will ring once maybe twice, then stop, like the caller hung up, then immediately start ringing again as if it was a new inbound call.

Anyone have anything like this happen after adding a second eSIM?