Is Toast doing the compression or are you using something else? I’m assuming the material is 4:3 to start and it sounds like whatever is compressing it thinks it’s 16:9.
You need to give us a lot more information about what title tool you’re using and exactly what you’re doing to create the titles in the sequence. This normally doe snot happen.
If you leave the messages on your computer they remain on the server. When the messages get deleted from your computer they’ll get deleted from the server.