What if someone bought gifts, but none of them were redeemed. (in my games gifts section) if there are codes in there or on pm, someone could steal them if they had the access.
The bug some of you were experiencing is related to the caching solution that we're currently testing and tweaking. Apparently for some users it was delivering a wrong (old) html of a publicly available page
(one that's the same for everyone). In the worst case it meant that you might see a random avatar and a wrong cart on top, but there are no user details there and you cannot make any changes to it either as it's a cached thing (think read only).
More importantly, all your personal data and content (your games, PM's, order details) is safe here, as it is always delivered over a secure connection and is also NOT cached, therefore nobody can see your games or messages because of the bug outlined above.
Last but not least, for the time being, the caching solution will be taken down, until we can nail the issue.