This is a work around for the bug in the active quest window. You can read more in the thread on the eq2 forums here:
Basically the client is resizing and moving the object containing the steps when you get a timed quest or delete or finish a timed quest. It's incorrectly doing this causing the steps to scroll in a strange way.
I added an outline to the TreeContainer object so it's easy to see the problem. Here are some screenshots.
Before accepting the timed step of a tradeskill rush order quest everything looks ok.
After you accept the timed step.
After finishing (or deleting) the timed step.
The attached xml file has a work around for this bug. When you're on a timed quest or after you finish a timed quest just click on the name of the quest. There's a hidden button that resizes the TreeContainer object correctly so it would look like this.
Hopefully SOE will fix this since it's a pretty obvious bug. Until then you can use this work around.