Are you 100% sure that you downloaded the Electrum wallet from ELECTRUM.ORG ? How did you arrive in Electrum's website? Was by clicking in a link that you find while searching on Google?

This is not the first time someone comes here saying that he downloaded Electrum, sent some coins and they were sent to a different address. In almost all cases, the user either downloaded a fake Electrum from a similar website which ads were showing on Google or he had a malware on his computer. This is 99.9% not Electrum's fault.