Hello,
We appreciate your taking the time to post a screen shot. Would it be possible to check on the other questions we had:
Also, have you modified the following file: ~/CMSModules/EventManager/Tools/Events_List?
Additionally, could you please access that page then check the Site Manager > Administration > Event Log again? If possible, please send us a screen shot of that page as well.
Can you think of any custom code that could be tied into this? Do you know when this issue first started occurring?
If the site is available online, would you like us to access it and investigate? In that case, please send an e-mail to support@kentico.com
Regards,
Sandro