red highlight shown on apparently random lines

This code is alright, but for some reason PHPStorm will red-highlight one of my param calls:

 

Funnily enough, I delete the "offending" line and I get this:

 

What's going on? It doesn't seem to be an inspection, at first sight.

Kind regards,

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2 comments

When I add or change lines, the red markup runs around the lines...

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First of all try to run File > Invalidate caches and restart.

If that doesn't help - try hit Alt+Enter while the caret is on such words - would it show any Inspections options?

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