Repeat notifications when turning phone back on

If someone texts me at night while my phone is off, I will get the text multiple times in the morning when I turn it on. Is there a way to fix this?
I am running the most current software, using default app, on Pure Talk service in the US. My daughter is having the same issue, on Dark Star network with US Mobile.
This morning I received the same text 10 times several minutes apart each time. I thought someone said this was a provider issue but if my sim is in my old iPhone it doesn’t happen so I’m thinking it is specific to Kompakt.

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@tkbunch This is odd. Has this just started? I think you’ve had your Kompakt for some time? Did it happen with the previous OS version?