Rat Rod Rockers! 16:9 Version

So I thought I was finished re-cropping Rat Rod Rockers! into a 16:9 Widescreen format. After I exported the adjusted clips into one file and then threw the Widescreen Matte on the file, I noticed slight (one pixel) movements on the Widescreen borders. I tried this several times with several clips that should not have had done that at all. So I figure it's some kind of anomaly in the filter. I think the work around will be to export the file again and then use the "crop" adjustment to manually crop the file. This cannot (or at least should not) move once it is set. We shall see.