Some of the single quotes are replaced by some encoding "'".
I took the project now and don't know if these fields have been created due to a migration or not.
Any idea how to solve it ?
You can go to the global administration -> Issues -> Custom fields.
If you see the broken names also there, then just rename the fields and it should fix it.
Otherwise, it may be just that given screen that displays them with this escaping, so question is which screen is this?
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