Hi,
I can confirm there is an issue with the keyword highlighter. The exact matching works all right, but the highlighter simply highlights the first phrase match incorrectly. Luckily this is a very minor bug and I was able to locate it and find a potential fix already.
Please download this beta version and install it.
After installation, clear all layers of cache so the scripts are refreshed. After that, the scrolling should prioritize exact match highlights and scroll to the first location of a possible exact match.