I created a rubric recently and it is buggy as hell. Starts changing numbers that I did not even put into it. I had a simple 20 point criteria with 4 boxes, five points each. Instead of clicking one box and it showing five points, I click one box and it highlights all of them and still shows five points. I am then not allowed to highlight any thing else. ?????????
I am using an updated version of Chrome.
John A'Hearn 
That could be it. Why can I not make each box the same point value. It is a simple note taking rubric students get points for doing the work, as the page fills the points go up. It seems odd that rubrics need to conform to one way of delving out point value.
Canvas lets you make rubrics with a bunch of different criteria that all have the same point value in the same line, but when it goes to actually store rubric information it just stores numbers rather than box clicks so it'll give the students all of the things in that line with that point value.
I consider this UI mis-match a bug, but Canvas does not for some reason. Support told me that fixing this was a "feature request" since apparently the current "intended behavior" is to aggravate people in precisely this way, and when I made one of those (Resolve disparate options used in rubric creation/editing versus use ) it was sent to Cold Storage with no comment from anyone from Instructure (or anyone else).
(I'm...a little cranky about this.)
Linnea, I responded to your message in cold storage so it wasn't feeling so lonely.
I tried to rework it again, I tried to put 5, 10, 15, then 20. It ends up changing all of numbers as if it knows what I want the score to be. This is a beat rubric system. How can I not put a simple 5 point scale rubric into the thing. SMH gues I will post the rubric and have students guess what they got wrong....
John, it would be great to see screenshots so we can help you sort this out. In the meantime, from your description in one of the comments—"It is a simple note taking rubric students get points for doing the work"—it sounds like you're using a rubric as a checklist, and that you don't wish to assess how well they've done the work, only whether they've done it or not. And that's certainly possible, as long as you have a yes/no setup across the row: students get full (5) points for doing the work, and 0 points for not doing it.
It's not clear, though, what "doing the work" means. Is this rubric associated with an assignment, or a discussion, or a quiz?
We're happy to help you out, and look forward to hearing more.
You have to put the highest numbers on the left.
And yes, Canvas does change all the numbers because it thinks it knows what you want. Which has been helpful about 25% of the time and...not helpful the other 75%. e.g., If my points are originally 20, 15, 10, 5, and I decide that row should be worth a maximum of 10 points instead of 20, I can't make the high number 10 unless I reduce the 15 and 10. But then I make the high number 10, and it further reduces what used to be 15 and 10, so I have to redo each number 2-3 times to get the numbers I want to "stick."
As always, James Jones's rubric import script saves the sanity...
Hi John
I will ask the most obvious question - which browser are you using, and is it current? This does sound like a browser issue. Despite what is stated at Which browsers does Canvas support? , we have found that IE is incredibly unreliable, and always suggest Chrome or Firefox to our users.
Kelley