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i tried a regular text box field with validation set to numeric & used a number field.
i entered ".5" on both fields - both instances were accepted and no error messages were given.
maybe something in the field properties needs to be tweaked?
could you share your form link so the community / support team could help troubleshoot?
Looks like you are currently using the source codes with a custom validation in the field. If the form is embedded, please let us know the page URL here so we can check further.
This is your last form ID http://www.jotform.us/form/50115147283145 and it's accepting .5 or 0.5 without any issues.