Is this happening with all of your events, or just one?
Are these YOUR events, or did someone else post them? If someone else, are you HTD or LEADER? (They are the only folks with permissions to edit someones else's event)
If all the above seems fine, then sometimes there can be some browser funkiness. Make sure you have a current version of what ever browser you use (let me know what that is) .
Also try just pressing SHIFT and click the refresh button when funky stuff happens, that gets a entirely fresh version of the page. Sometimes weird things can happen with the cache, and the SHIFT refresh will clear it.
I added a few tourneys and remembered after I entered the one for Sunday that I agreed to host in place of 1TOP NASCAR. I clicked on Sunday's event and edited it, changing the host to my name (both the field for what TK displays as well as the one for the tourney board inside the HW client). Only the one for the HW client seems to stick... 1TOP NASCAR still shows for the TK field.
I tried holding shift while clicking the reload button but it changed nothing.