What version of Unity and 2D Toolkit are you using?
There was a bug in versions of Unity prior to 4.2 where the camera preview was wrong (which is why we have our own preview window). The boundaries are wrong as well. AFAIK it was fixed in 4.2, but 2D Toolkit 2.x added a custom drawing code to work around the unity bug as well. Looks like you're on an old 2D Toolkit & unity.
Anyway, here are the tk2dCamera docs.
http://www.2dtoolkit.com/docs/latest/tutorial/tk2dcamera.htmlThe most important thing is that your sprite collection + tk2dCamera settings must match. If your tk2dCamera is set to 1 pixel per meter, then your sprite collection should be set up the same way. Otherwise, your sprites won't be the right size.