Moodle in English: Grades overridden randomly

Gradebook

I have at least one instructor with 76 students in the course that recenlty is getting half or some of the assignments where the grades are overridden or have an overriden status. What is weird is that for a particular assignment, it is only half of the student assignmens that are impacted like in the snapshot below.

The assignments are regular assignments.
I believe the faculty is entering the assignments via the View/Grade assignments option after clicking on the assignment from the course page.
This is happening for future assignments that are not even graded yet but not all of them.
Problem is that you can no longer enter a grade from the assignment from step 2.
Environment: moodle 2.3.1

Question: Does anyone know what is causing this? Is there something that the faculty may be doing? Is it because of the large number of students in the course that something is getting corrupted?

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Could this relate to MDL-34363 in the tracker?

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Pretty sure this is related to the Tracker item. There is a fix listed that I have successfully applied if you are up to changing core files.

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This is still happening and we are on Moodle 2.3.4+. It is not related to the tracker issue. Now where do we go?

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We are having this same issue and our faculty are very upset. We have had at least 10 cases this week of courses that have the Course Total as overridden and students are freaking out. To fix this we go to the database and manually change it so that the column is no longer overridden.

What we would really like to know is what causes this. It happens with random columns and like Sal it doesn't always happen to an entire column.

Any thoughts on what causes the column to become overridden randomly?

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We have seen the same issue. One thing that we have noticed is that if you even click or tab into that field then it will override the grade. I see there is a fix in this forum, but when I clicked on it the page was not there. It would be VERY nice if the calculated fields could not be overriden unless you click on the editing pencil to access the that screen. It is too easy to override grades accidently and then the calculation no longer works.

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I am having this issue also, but only with one course. It is one of the courses that has the biggest number of grading items and students.

I did apply the patch according to this http://tracker.moodle.org/browse/MDL-34363

but have left the "quick feedback" off anyway, so that shouldn't be the problem.

There has been talk about not having the max_input_vars set high enough will cause grades to not be saved. I wonder if it also causes grades to be overridden. I will look into this.

https://moodle.org/mod/forum/discuss.php?d=195431

Just wondering...

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