That is very odd. Have you viewed the assignment as a student? Does it give the same error? If it doesn't, it is mostly likely an issue with the students' device or browser? I would suggest to the student to try a different web browser, clear the browsers cache, and/or restart.
If it does show the same for you in Student view. I wonder if something funky is happening with your HTML. I you notice, there is a sentence missing in the middle of the paragraph as well, between VOCAB and "Use this order..." I would take a look at the HTML, If you're not comfortable in looking at HTML, I would highlight all the text and choose the clear formatting tool. Or, try copy/pasting the text into a text editor like NotePad or Text Edit. Then paste it back. That sometimes clears things up.
See the "Remove Text Formatting" section on this guide.
https://community.canvaslms.com/t5/Instructor-Guide/How-do-I-add-and-modify-text-in-the-Rich-Content...
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