Thank you for looking into this for me. I believe I have corrected the mistake. :)

It is happening to all of my courses except the first one.   Correct: https://si.agilixbuzz.com/teacher/217676694/activity Incorrect:  https://si.agilixbuzz.com/teacher/217676423/activity  https://...

I am also having this same issue. My first course doesn't glitch, but after a few days my other courses will do the same as Natasha mentioned.