I'm running v1.14.3 but also have access to another system running 1.14.2 which exhibits the same behaviour, we have the Auto Refresh Rate set to every minute and some of the users (happens in Chrome, Safari and Firefox) have noticed that when the loading bar appears, the entire page moves down by a number of pixels (2 I believe), they've reported it being visually quite jarring for the eyes, if you are reading text as it happens.
What would be need to make the loading bar float on top of the page, I see in the css file the z-index was set to 2147483647 but that isn't putting it above everything else like I would've expected (I'm not a web developer so I don't really understand it to be honest).