Forging transactions disappearing from the My transactions list

Hello,

I keep the web interface open for a long time. When I start the client and first login into the web interface, I can see the few forging blocks I made in the My transactions list but at some point, after a while, those forging transactions disappearing from that list for no reason.

This has been happening for a while in the 0.7 branch but it is also true with the 0.8 one. I can confirm this is happening with 0.7.6 and 0.8.2e.