Object compare jumps pages

In the last several releases (and also the current BETA), in Object Compare / compare script tab, if I click on either scroll bar to page up or page down, it appears to jump up/down 2 pages, not a single page. For example, if the windows show lines 1848 to 1892, a scroll bar click will go to 1760/1804 or 1936/1980.

I see that, thanks.

Update 12/9/2019: Fixed in Toad for Oracle 13.3 Beta