But if I had to guess you have multiple networks using the same L2L VPN and you have added some addiotional networks to the L2L VPN connection. Other side is probably missing this configuration from the L2L VPN settings.
I'd imagne the hitcount is getting higher as the traffic reaches your VPN device and hits that rule. Then again the VPN devices cant negotiate that portion of the L2L VPN up so traffic is not getting encrypted and sent to the remote end.
So make sure that both VPN devices Encryption domain configuration match. (In mirror images that is)