Shantonu,
Thank you for responding. Yes, I have a triple monitor set up and ArcMap is always running on my main screen. Just as a frame of reference, this has only happened twice on my computer and once on another user's computer.
It seems to be hit and miss of the toolbar migration. I've tried all of your suggestions before asking this question...and just decided to drag and drop them to the correct positions.
Dan,
I am running a sufficient enough computer with Windows 7. I have only noticed this problem with 10.3 as well.
Thanks for the replies.