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Deleting comments disturbed

First removing of comments is displayed correctly, the comment is removed and the text inputed stayed. But further removing, after reopening edit window, is disturbed, as background is getting darker and user has to click Ok, Cancel or X to get it white and delete a comment. The comments are removed, just look no good.
Checked in safari and Firefox.

See movies:

ownCloud/Disease maps/Minerva docs/test-issues/12.1.8/issue697
ownCloud/Disease maps/Minerva docs/test-issues/12.1.8/issue697_dark