Does anyone know why my finder window resizes when I enter time machine?

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Can anyone explain why my finder changes size when I enter time machine? I'm pretty sure this didn't happen on Snow Leopard but it does since I installed Lion. It's only a small glitch but it's rather annoying since I have positioned and resized the finder window on my desktop to the place I want it - in the centre of the screen and showing all the folders in my sidebar list. When I enter time machine the finder window becomes shorter, therefore not showing all the sidebar folders. I wouldn't mind if when I exit time machine it reverts back to the way it was but it doesn't so I have to resize over again!
Anyone know why this happenes?
Take a snapshot of this issue and send it to Apple. I think it may be a small glitch.
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