Mysterious gray lines on my patterns

Okay, so, I'm pretty new to illustrator so you'll all have to forgive my ignorance. I've created the pattern that i've shown in the image, and when I'm in working on the pattern these gray lines dont appear, but then once i back out and fill a rectangle with my pattern, these gray lines always appear on top. I've noticed they change according to how i organize my pattern. (by grid, by hex, etc). I tried adjusting the rulers. The most frustrating thing of all is that they appear when I export the image. Please help! Thanks!

Turn off "Anti-aliasing" in Preferences to check if the lines are gone then.
If they are, it's just a screen redraw issue.
When exporting in raster based formats, select "Art optimized" method.

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