getPageNthWord keeping parentheses even with bStrip NOT set to false

Hello, when I'm using getPageNthWord, if the word is inside parentheses it keeps a parenthesis attached to the word even with bStrip parameter set to true. And what is strange is that only the "(" opening parentheses are kept, the closing ones are not.  This is problematic because when I want to match the document words with a search it doesn't match. It could be fixed manually by checking if the NthWord contains a parenthesis and removing it with replace() but I think it would slow performance on longer documents ?? Any explanation on this would be very appreciated !