Adding more detail. I removed everything from my Community folder except for KEYW. Ran MSFS with a generic Content.xml and another where I placed the KEYW dir at the top. Both cases resulted in having double tower guy and people.
At least we should exclude, in your case ( which affect you and only 1 other guy so far ), the possible conflict with another scenery, so it must be something else.
Are you SURE you haven't touched anything after the installation ? Where, exactly, you installed the Addon Manager folder and where, exactly, your Community folder is located ?