[tor-relays] Relay reading more than it writes??

Hi All,

I recently started running these two relays on raspberry Pis in the UK:

http://torstatus.blutmagie.de/router_detail.php?FP=515a9887a426c1dc2bb4b9b1b...

http://torstatus.blutmagie.de/router_detail.php?FP=e3e6a7de02caa12ac57128844...

Both of my relays seem to consistently read more from the network than they write, and I can't figure out why. Are my relays dropping loads of packets? If so is that harming the speed or reliability of the network? Why are my relays doing this when other ones seem to have a perfect read / write balance??

If anyone has any ideas why this is happening or how I could troubleshoot the issue I'd be really grateful!

Thanks,

Rupert