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Blue lines grid on top : error

Asked by praj
9 years ago.

I am populating about 100 slots each of 10/15 minutes in a week. There are strange blue lines appearing on top and at the end of every slot.

When I try to edit any of the slot by clicking on it, blue lines grid is highlighted.

slots are in session datatable.

I don't want this blue lines' grid to show up at all.

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