LibreOffice 5 on Windows 10 - rulers all messed up

I have just installed LibreOffice on a Dell XPS 15, running Windows 10. The vertical and horizontal rulers have markings all over the place, and the one measurement number displaying in the middle is not 4 inches, but rather “4.00000000001” inches. There also appear to be “center tab” markings every half-inch or so.

I have a screenshot if someone can tell me how to upload one of those.