maxlength fails with content has single quote

I have a field for entering comments in form – i put maxlength condition to 5 (forexample) – when my input string has 5 alpha numeric chars, the validation passes – but if it has 4 alpha with 1 quote – validation fails

eg: passed string: asdfg

failed string: as’df

i using PHP8.2, wordpress 6.4.2, contact form version 5.8.5

i see old version of contact form plugin – stripslashes was used and this is missing in the laest version (not sure)