Premiere Elements 10 Clip position changes when creating the file to share

Hi I've added an image to hide some content in the video in track 1. So the image is sitting in track 2 and I've resized it to cover the area I need. It sits in the right position during editing in the display window, but when I save the file to share it, the image moves position and so is no longer hiding the content I need to hide! Any suggestions on how to get it to stay in place or anchor it in position? I basically have a recording of lots of people in a zoom call and need to hide one person so they can't be seen in the final video.  Hope that makes sense. thanks