Today I've helped flag a lot of spam for this: SPAM deluge over at WebApps (and pretty much all over SE).
When I've visited my profile on WebApps to see my flag history of flag, the information about my flagging history was missing.
Note that these spam flags were my only flags on this site.
Normally, I should have more information like when I'm looking at my Stack Overflow account.
Is this a bug?