Notification Text Not Visible in iPad

Hello!
Into my iPad, notification text is not visible when any template is active. If I use default template text is visible.

I’m attaching a video so you can see what I mean: https://drive.google.com/open?id=17AGZGrh787su_sbSg0K-eyd0jZYAOEzV

I think the problem is related to the background image’s z-index which is greater than the text’s z-index. I tried to fix it but I couldn’t. It’s not even a cache problem since if I switch to the default template everything work

Please can you check this problem?
I await for a response

Best regards!