Originally Posted by Pop N Wood

Some forks have a lot more movement than others. Some forks cost considerably more for that reason. Had an old Suntour fork that used rubber donuts for suspension. As they got older they compressed into solid pieces of rubber that lost all give. I rebuilt it once, putting in new rubber donuts, but when they wore out a second time I bought a better quality fork.

See if you tell us what brand of fork you have, or post a picture.