how to tell if you have rebounding hammers

[B. Dudley]

Technically, the sear spring is what provides the tention to return the hammer/tumbler back to the half cock position. The key to making the rebounding hammer work is the step on the bottom of the lock plate which stops the downward movement of the mainspring thus allowing a small amount of free movement of the hammer.

[Austin J Hawthorne Jr.]

On both of my 10 guage hammerguns the hammers can not be pushed foward without pulling on the triggers, but can be if the triggers are pulled back.
I thought that this was normal. Am I mistaken?