Firewall/NAT

Hello,
I'm new to m0n0wall and I can't understand what triggers these reactions from the firewall:
(http://img508.imageshack.us/img508/6258/firewallzo8.th.jpg)

The only rules I have is to allow ports 22, 80 and 62559 and NAT them to a machine on the LAN which apparently sometimes goes wrong. And why is traffic from the LAN to websites sometimes denied? The firewall rules where issued by m0n0wal when I set up the Inbound NATs. Switching to raw logging gave this on the issue:
22:01:26.337079 rl0 @0:15 b 82.47.xx.xx,59985 -> 192.168.xx.xx,62559 PR tcp len 20 40 -AF IN NAT
22:06:56.048601 xl0 @0:15 b 192.168.xx.xx,2940 -> 216.239.xx.xxx,80 PR tcp len 20 40 -AR IN

Thanks for helping out a newbie

Kent

PS. 1.3b10