I have just noticed there is a bug in the line selection. I created 3 new tasks, which appeared at the top of the page in gold. While they are still visible the selection of other tasks further down is correct.
The issue arises when the new tasks go off the screen (I scrolled down the list moving the screen display to a later task to select it). The selection highlight is then offset incorrectly by the newly created tasks.
This is only noticeable when the new gold tasks are move off the visible screen by scrolling
I tried to reproduce the bug you discovered, but I was unable to do so. Can you please create a support ticket and attach a screenshot that shows the problem? This will help us figure out what is going wrong.