Chrome Checkbox function does not work! (Webpage thinks)

Im trying to use Chrome Checkbox function on KM. The webpage Im reviewing has few checkboxes that must be checked to proceed to the next page.

KM successfully detects and lists checkboxes on the webpage. However, when I try to submit and move on the next page, the webpage says that I need to click the checkbox. Thing is, the function seems to work properly and does check the checkbox. A square shape is filled with blue colour meaning that it is checked. But the webpage thinks that the checkbox still has not been clicked. So I have to manually click it and submit then it works fine. It is truly frustrating for me haha. Unfortunately the webpage is not public one so I can't post it here, I wish I could.