Strange image not found artifacts appearing on Android

[jumblemuddle]

I’ve been banging my head against a wall for the past day or two trying to figure out why this is occurring.

Here is my code for this single tab.
<div><h1>test</h1></div>
<h1>test</h1>
The odd thing is that if I remove either of these lines, the artifacts disappear.
Has anyone experiences something like this before?

[jumblemuddle]

It should be noted that this also results in these artifacts:
<div></div>
<h1></h1>