Hi Bill,
The TIFFs are small in what way?…the reported file size? If so, could it be that you’re saving with the LZW compression enabled? That would certainly reduce the file size although there’s no problem in that other than increased open/close times.
If you mean the cropped image size is smaller than desired, the only thing obvious that comes to mind is to ask if your crop options in the Options bar were correctly set?
Regards,
Daryl