LOOPING PARALLEX PROBLEM? IS IT SIZE?

So uh. I tried my hand at making a map today!
Really rad.

But I followed a tutorial to a T - (to make it easier, I even exported the map from the game to draw on, so I wouldn't have to worry too much as I've got a severe math disability which means I can't really learn numericals and terms associated with em'.) and it's doing this repeat thing.

I don't want it to do a repeat thing.

Photo!! Clicky clicky.


I didn't think it'd do this.
Anyone know how to fix this?

If this info helps, I thought it would be size issue or something but it's just the default map size, and default map (just drawn on). It's 17 x 13.

(I missed the tag thing. It's RPG Maker MV)