Elements shift when using chrome dev tools device toolbar

[Attached picture is with the device toolbar activated and the h2 off to the right.] 1 Potential newb question here. I'm working on a website and writing media queries. When I use chrome devtools and toggle the device toolbar, some elements shift, either their width or position. It gets really annoying because I'll think I'll have all the css correct for ipad or mobile, and then when actually looking at the site on ipad/mobile things look off.

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