Have a page with a continuous sum on it.
The sum is automatically populated and allows the respondent to review a selection of answers.
However, when reviewed by the respondent all seems fine, when they try to submit the error message “must be currency” is shown.
All fields shown in the sum are currency, so not sure what the issue is?
It’s a bit difficult to say – my suggestion would be to review the question settings (by editing the question and navigating to the Validation tab).
Perhaps you have the ‘force whole number’ setting enabled and some of the values entered are not whole number? (just throwing out some ideas)
Hope this helps!