Issue with Cells Showing Blank After Left-Clicking in Data Column

Sometimes I'll left-click on a cell that has run to read the contents, but then the contents will blank out and then it will say 'cell did not run'. You can see here the blanks were all cells that run since I ran run first 10 rows for this column. But on every few that I click, the text would disappear and then the Cell details box would say 'Cell has not run