Grading status not updating

I've created an assignment where students are graded only with feedback. Grade type is set to "None" from assignment settings.

For some reason if I grade student with the grade button on grading view, the status won't change on the assingment starting page (see the screenshots).

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The status is only changed if I use Quick Grading and then insert the feedback. We are using Moodle 2.9.3+ (Build: 20151113) and my text editor is "TinyMCE HTML editor".