Suddenly spell check is treating dashes like part of the word?

[DrReddP]

Why, and how do I fix it

[niksedk]

Could you attach the subtitle?
Probably not a standard dash.

[DrReddP]

How do I check the nature of the dashes for myself?
TaskmasterNZS02E01.txt

[niksedk]

You can try to paste your text into one of the online analyzers, like https://www.fontspace.com/unicode/analyzer

You can also try SE's Tools - Fix common errors - Normalize strings.

Also, SE now updated to handle this better: https://github.com/SubtitleEdit/subtitleedit/releases/download/3.6.1/SubtitleEditBeta.zip