Functional - Form Builder : Signature control not working as per expectation

Steps:-
1] Log into the codemap site using sa and W0rkterr@ credentials
2] Search and select UiRefresh_DC_QA_13554 company.
3] Search and edit Venky Demo Form
4] On Design form layout add controls like Signature
5] Now search and select any active employee for whom the form is eligible
6] Now add a signature and click on save button. Revisit the page and click on save button the system is displaying a validation message for signature whereas it is already present

Please find the attached screen shot