Same thing for HOVERING. Hovering over 7 vs 1 underlines 6 cells in the grid! Hovering over 7 vs 1 should underline only 7 vs 1 and 1 vs 7....
To quickly overwrite old temporary reports I always name mt4 reports by a number 1.html, 2.html etc. It looks like this bug is only affecting me because I do this.
Renaming the reports to have a letter in the filename of the report makes this bug go away. This bug only effects reports named 1.html, 2.html etc.