If you use your mouse to “drag and drop” your firewall rules under an application it get’s positioned on the wrong “side” of the rule, it always get’s positioned on the rule “above” where you want it.
This is an english post for this one:
https://forums.comodo.com/empty-t24678.0.html
Confirmed on Vista SP1 x32 - CFP 3.0.25 and XP SP3, 3.0.25 by at least 3 different users.