One of my battle backgrounds broke, pls help

Take a look at your battle background properties at offset 0xE70006. This is the data for the world of ruin forest background. Here's what it means:

Code:

E7/0006: 9A ; load graphics 0x1A to VRAM at $1000 (0x2000 bytes)
E7/0007: FF ; this means don't load graphics to VRAM at $1800
E7/0008: 19 ; load graphics 0x19 to VRAM at $4800 (0x1000 bytes)
E7/0009: 0C : use tile layout 0x12
E7/000A: 0C ; use tile layout 0x12 (this byte is never used)
E7/000B: 31 ; use palette 0x31

From your screenshot, it looks like one of the first two bytes here might be causing the problem.