Track Matte only shows a random piece of the image? Screen recording included

Hey there,

I want my text to appear "out of nowhere". This is the tutorial I am using as guidance.

- My png text comes in from the left into the middle.

- I have created a png alpha shape in which it is supposed to appear.

- Track matte on the png text layer, matte on top. Matte sources from the video layer with the text.

However, when I finish the process it only shows some random little piece of the image instead of the full thing. See screen recording video below. I thought it might be that my file is corrupted, but I have created a new project and it does the same thing. The tiny block that does show up in consistent when I reverse the image, by which I mean that it then transforms in only a little block that is see-through. When I scale up my shape it shapes with it.

How can I make sure that everything that is in the shape is visible i.e. get my track matte working as it's supposed to?