1. Bug: A checkbox that is marked as 'required' will always require to be checked in order to submit the form.

Description:
If a checkbox is used in an Adobe Sign template and is marked as 'required', the only way to submit the form when signing is if that checkbox is marked as 'checked'. If it is selected as 'checked' and then again as 'unchecked', the form cannot be submitted. This is of course not the wanted functionality, all other objects that have more than one selected status, even when marked as 'required' once visited, the 'required' requirement is met and the form can be submitted. However with a checkbox the 'required' requirement is met only if it is selected as 'checked', which is incorrect behaviour.

1. To reproduce: Add a checkbox to an Adobe Sign template and mark it as 'required'. Create an agreement and fill, sign and try to submit. Only if the checkbox is 'checked' you will be allowed to submit.

2. The bug is not related to the environment. The environment is Ubuntu Linux, using both Chrome and Firefox.

3. Expected result: Once a checkbox that is marked as 'required' is visited (like clicking 'checked' and then 'unchecked' I should be allowed to submit the signed form, regardless if the checkbox is 'checked' or 'unchecked'.

4. Observed result: Currently only if the checkbox that has the 'required' attribute is marked as 'checked' I'm allowed to submit the signed document. So I cannot submit the document if the checkbox that is marked as 'required' is 'unchecked', which is obviously incorrect.