Odd Behavior in Outlook

We use Microsoft Outlook 2003 SP3 for e-mail & on my PC it is doing something strange in the calendar.

We have a company calendar in Outlook which we use to record meetings, visitors & other items. Anyone can add an event by double clicking in the calendar, if I do this then by default it lists me as the 'organiser' which is fine.

The odd thing is that, if I open events added by others, it will sometimes but not always substitute my name for the name of the person who really added the entry. This is annoying because I tend to check these entries to see if I am meant to be in any meetings in the next few days.

As far as I can tell this is only happening on my PC, checking the calendar on other PCs shows the correct listings.

Any ideas what might be going on here.