Post information collisions

Hi,
I’m having a strange issue in my site:
when I publish a post the information which I use in Custom Fields migrate in other posts:
the issue looks related to duplicate id’s being created in the database which is causing the collisions of the event posts (information from one post appearing in another).

Here it is an example please check it out
The top on I set up two weeks ago. The one below I set up the day after and the date/location info migrated into the first one. It is still happening many times. Any help?

My site http://thisweekin.net/socal/

Thank you