I haven't done a shop for ISC in a long time, and can't envision the problem you're having. But I do remember having a lot of technical problems with saving and submitting answers almost every time I did one for them. One time I had to e-mail them because I wasn't able to submit my report until shortly after deadline because of all the glitches. I think I was told that certain browsers weren't ideal with their system. I use Firefox, fwiw.
I'd e-mail them, to alert them that you think you might be experiencing technical problems, in case the problem is something technical and you are supposed to be able to answer those questions. I can't recall seeing questions on the survey that didn't need to be answered, but, like I said it was a long time ago.
I learn something new every day, but not everyday!
I've learned to never trust spell-check or my phone's auto-fill feature.