IPhone Screen Turning Pink When I Try to Close Out Apps?

Yesterday my phone randomly shut off and when I turned it back on half my pictures were deleted. The screen was pink so I started up my phone again and it went away. However, whenever I double click my home screen and try to swipe away or close apps I've been using the background screen is a bright pink color. What's wrong with my phone and why is it like this?

This is what my screen looks like

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