stbi_write_png() function subtleties when writing a file

[quaesitor-scientiam]

I can successfully write a separator combine that with image no problem

When I combine it with this image when I padded the 96 wide image with 4 transparent tiles of 8x8 tikes to bring the length to 128.

Padded

Combined with separator

Then the problem

Why is the stbi_write_png() shifting the tiles? Are transparent tiles recognized?

[quaesitor-scientiam]

Fixed issue by forcing width to be 128