Github user r-kamath commented on the issue:
https://github.com/apache/zeppelin/pull/2952
Run all/selected button behavior is not right when selected paragraphs are
removed. Until reset selections/refresh the page retains the selection count.
<img width="1678" alt="runall"
src="https://user-images.githubusercontent.com/2031306/39520656-2ac1c088-4e29-11e8-9b0c-4ac2848d9737.png">
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