Definatly not. Make sure all your clamps are tight and that your rad isnt leaking where you dented it. its possible that you broke a braze or somthing that isnt enough to spring a big leak, but might drip occasionally.
I would leak test your system. if you have a decent amount of antifreeze in your loop, it will show up on paper towel really nicely.
Also, is your T on tight? its possible you are evaporating a bit from the T line. and of course, some tubing absorbs fluid at a certain rate.