When exporting via Save As to either jpg or png and I get one section of the map that the foreground and background colors invert and the map gets messed up (see attachment).

When I export at 1723x2573 pixels this does not happen. but once I do it 5 times higher (like in the attachment) I get that same error/inversion both when doing a jg or png export. Specific resoutions I've tried are 8613x12863 & 17227x25727 pixels.

Ideas?