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...make any post it shows someone else's username

This implies that you make the post and after it is made it is assigned to the wrong user. Is this what you are saying?

And Steve is quite correct in that Simple:Press does not handle any login/logout or user identification processing. This is all WordPress. It is WordPress core functionality that informs Simple:Press and all other plugins of the current users identity.

We had a small problem - many, many versions ago - where it was possible under some circumstances for a non-logged in user to be identified as someone else - but only up until the time they logged in and it was, as I say, many versions and some years ago. Any other instances of mis-display - which are rare - have always come down to page caching and as we continue to say - the SP page must be excluded from page caching plugins.