I've found something odd happening and I'm not sure if it has something to do with my survey settings. All the questions in the survey are mandatory. If I save the survey and return to it, and click continue, all of the multi-select questions that include 'Other' (whether selected as an answer or not) trigger the 'This field is required' alert. You can't continue unless you re-answer those questions. Questions that do not have that as an option maintain their answered state. I've attached a screengrab.
Please let me know if I'm doing something wrong.
Thanks so much for your help.