Minimize / Restore / Close button is on unnatural position.

HiSky    I think that I figured out what is going on.

First, a refinement of the screenshot used in an earlier comment, this time showing horizontal block in which the Minimize/Windowed/Close buttons are located, with the bottom of the block underlined in red and the center line shown in blue:

Second, a screenshot of the Minimize/Windowed/Close buttons in Edge Chromium shown in relationship to the tab bar, immediately to the left of the buttons, again showing the bottom of the block in red and the center line in blue:

And finally, a screenshot comparing Edge Chromium Dev Version 78.0.268.3 and Linux Chromium Version 76.0.3809.100 (Ubuntu Official Build):

Note the difference between Edge Chromium and Linux Chromium.   Linux Chromium uses two horizontal blocks, one for the Minimize/Windowed/Close buttons and another for the tabs.  Edge Chromium (and also, I believe based on your screenshots, Google Chrome) for Windows compresses the two blocks into one in order to conform to Windows 10 design protocols, splitting the block between the two functions, right and left. 

For whatever reason (probably inattentive coding), the Minimize/Windowed/Close buttons do not center vertically in the portion of the horizontal block assigned to them in either Google Chrome or Edge Chromium.  The issue also appears in other Chromium-based Windows browsers (e.g. Brave) that compress the tab block and the Minimize/Windowed/Close buttons into a single horizontal block.

It seems to me that Microsoft should treat this as a bug and fix it.