Hi @vedantbob again,
I felt bad waiting until Monday to see what was happening so investigated immediately.
The problem was that there were extra space characters entered into the input box (review the test and selected all the input box characters and you will see). Sometimes there were spaces at the beginning and sometimes at the end.
Anyway, now we strip all the beginning and end spaces before marking so this shouldn’t cause a problem again. I have remarked that test (score now 14/15).