I loaded all my Strava information and Xert has calculated my FTP as 230. How can this be? I am a 106 lb 63 year old woman whose highest FTP ever is 148. None of my rides would indicate a FTP this high.

Except that your last breakthrough activity had an average power of 217W for almost 2 hours. Are you sure you uploaded/synced the correct data?

Aargh. That was when the Garmin Vectors went berserk and doubled all my power.