Maps appear blury and have lines between them when placed in item frames.

Hello! So, was toying around with some maps on my in-game table, and noticed that these maps, all of which are in item frames, seem to be rather blurry, as well as having small ultra-thin lines between the different maps in the item frames, not due to incomplete map creation. I attempted to pick up one of these maps, and it also appeared blurry when held. What exactly happened here? Anyways, that’s all, Rockatoa, Brickticks out!