What does "Context Matches are out of scope" means ?

Hi !
I'm beginner with Trados

I would like to know what "Context Matches are out of scope" means ?
In Trados, many sentences are CM. So is it goof or not in this translation ?
Some of them were 100% (in scope) but with a « ' » (straight one), which is wrong. If I change them to a « ’ », all of them became CM.
I really don't understand.
Should I keep 100% even if it's wrong ???

Thanks for your help

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