The query results table hides results for queries that have a number of rows that would fit inside of the window. After a query was updated, the Result hides the first row, and the user can not scroll up to see that row.
This appears to occur on tables where the number of rows will all fit within the view without scrolling. In these situations the results are available only by clicking on the result tab content and scrolling up with the keyboard. Scrolling with the mouse does not work to show these hidden rows.