Visual Inconsistencies When Exporting File

After finally completing my first map, I'm disappointed to find some issues when I attempt to save the file in a usable format to share with people. Whenever I export it as a png or jpg file, the map is full of errors like below:

For the most part it's hardly noticeable, but there are a few areas that are glaring. What seems to be happening is two lines of pixels are being repeated.

I can see this happening in 5 parts of the image at even intervals, so I think it has to do with the fact that the program renders the image in 6 parts. Instead of meeting correctly, the bottom of one section is the same as the top of the next. This just occurred to me as I'm typing this, so I now believe I should be able to go into GIMP and simply remove the repeating sections, but for future projects does anyone know a fix for this sort of issue?

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