Numbas appears to not be calculating score properly

[fbonatto]

Message received from an instructor:

Please could you look into an issue that a couple of my students have highlighted. The LTI does not seem to be calculating the score correctly as a percentage. For example, in the case shown in the attached screenshot, notice the third attempt scored 10/12 but this is recorded as 58%, whereas it should be 83%.

It is not happening very often, so it’s hard to see any pattern. Indeed, as you can see in this case, it only affected one of the student’s four attempts at the test.

Thanks for any light you can shed on this!

[christianp]

This can happen when the task to compute the scaled score is delayed. I made some changes to try to avoid this recently - can you tell me which version of the LTI tool you're running? If you can give the hash of the commit you're using, that would be very helpful.

[fbonatto]

Thanks Christian, the hash of the commit we're currently using is

'4df5b49bd821bb098036c06249a0090e050caad2'

[christianp]

That's v2.13.2. v3.0 should avoid this kind of problem.