Feedback → IM time tag problem?

The last couple of days I've noticed an IM problem. Either the time sent tag is wrong or I am not receiving them promptly.

Example: I was on the site last night around 9-10 pm & got a couple of messages that indicated they were 3 days old! Since I was not on the site on Saturday, 1-2 days were possible, but not 3. Then this morning at 8am, I checked & had 3 new messages -- all indicated that they were over 1 day old (1d7h to 1d10h). since I was checking my IMs 10 hours ago, that can't be right.