Video on YouTube comes out backwards(like in a mirror)

Jan 4, 2012
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I just got an iPhone 4s and I installed the icamcorder app. I recorded my daughter going her Acro routine last night holding the phone sideways to get more of the floor. when I put it onto youtube everything is backwards like I am watching it in a mirror. really weird. on the ipod it is fine but on youtube it is all flipped. kind of freaky. does anyone know why this happened? another video i took that night with the phone vertical it didn't flip the video on youtube. should I not video with the phone horizonal? or can is there a trick I don't know about?
thank you
Melinda