Reset the step (This will not affect any previously completed steps).
Enter the code as you have it now and run.
If this does not work, check for extensions that may be causing the problem.
It is suggested that extensions be disabled while submitting the code, if they are a problem. (Even my password vault extension causes issues at times).
Try submitting from a different browser.
Sometimes, browsers have built in extensions, or add-ons, that create the problem.