This keeps happening to me. I have read some forums but I am not finding exactly what I need. I want the image to not repeat. I am not sure if the image is the wrong size or the wrong file type. Let me know if I have not provided enough information.
This is a bug in the iOS version causing the repeating background. I recall having seen this before and thought we had fixed it. I will follow up once I know more.
The bug tripped for me right away. I managed to find the old PR meant to address the issue and brought it up-to-date with our current code base. The result has been put into TestFlight as build 2.64.4 (11).