Can you share some simplified code example that demonstrates this issue?
I think I've seen this before when using the browser's zoom feature. If this is what is causing the issue, you can press Ctrl + 0 to reset the zoom level in Chrome, Firefox, and IE.
Is this a bug that can be fixed via code? I cannot reproduce, but apparently, it is an issue for some users. Thanks!
Most of the samples use this meta tag in their HTML to prevent scaling:
<meta name="viewport" content="initial-scale=1, maximum-scale=1,user-scalable=no">
Not sure if this is still occurring; if so, are your users using IE?
This came-up before:
Tiled Map White Square Lines on IE10
Better yet, try removing compatibility mode, like so:
<meta http-equiv="X-UA-Compatible" content="IE=edge">
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