Shoutbox

I have been browsing the forums but i couldn't find my problem so here it goes...
Sometimes when im bored i check event viewer to see what my contacts did/songs they were listenning to, but i ocasionally find these wierd notifications that say that someone of my contacts changed his display picture but they didnt even log in that day and also when that happens i check their picture and it did not change and theres no notification on the "contacts news feed" thing of wlm

Any thoughts on what this could be?

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Edit
Forgot to add that this happens most of the time to the same contacts, one that logs in almost every day (but doesnt change the picture when i initiate a conversation) and another one that very rarely logs in