I'm having the exact same issue but not necessarily the same packages as the solution. I have the same version of sublime text.
When I have PHP enabled in package manager along with HTML .. the inline style tag color highlighting issue occurs.
However when I disable the HTML package .. the issue goes away.
I don't have SCSS, SASS packages installed.
Furthermore I have gone so far as to disable all installed packages and set things back to default, without any success.
There is a conflict inherent with the PHP and HTML code highlighting packages.