I am the guy that likes to use BenchmarkReport[],see here for example.
I noticed this loooong time ago after 11.3 was released, but never reported it.
I wonder if Wolfram making lots of changes to the Output of the format, but there seem to always be a problematic area to get the layout correct?
Needs["Benchmarking`"]
BenchmarkReport[]
Tested on both Win7 and Win10 (RS5).

PacletUpdate["Benchmarking"]? If that doesn't work,PacletInstall["Benchmarking"]. Even the latest version receives additional updates over the internet. They are installed silently. This should get auto-installed if you use Mma for ~3 days and you have an internet connection. – Szabolcs Aug 26 '18 at 15:24PacletUpdate["Benchmarking"]sorted! – Chen Stats Yu Aug 26 '18 at 15:32