employee and employer dates and signatures on a non compete contract

I worked for a company which was bought out. All employees were asked to have their non competes returned by 15 June 2009. I signed and returned mine on the 19th of June. Reason being, my father was also an employee but was not kept onboard, and I wasn't sure what I was going to do. Sept. of 09 I resigned from my position, and 17 March 2010 I requested a copy of my contract. I noticed my employer"s signature was dated 15 June ( a day they did not have my copy). Not only that, but the year was 2010. I did not work at that company a day in 2010. It looks as if they tried to back date their signature but by doing so they post dated it to a time which has yet to occur. Looks like they just signed it 2 weeks ago. I did willingly sign the non compete, but given all this is their any way this agreement can be void?