It's a very small bug.
Every element from the list of tables shown in the left frame, have a tooltip that shows the number of rows (i.e. "Structure: (20 Rows)", "Browse: (20 Rows)", etc).
After clicking one of these items, the page loaded in the big frame calls a javascript function named updateTableTitle (located in common.js).
This function removes the word Rows from the Tooltip.
tooltips sample
This bug was fixed in repository and will be part of a future release; thanks for reporting.