Imported illustrator file layers aren't vectors, seem to be raster images?

Hello,

I'm a new user of Adobe Illustrator but have been using Adobe Draw on my iPad for a while. I tried importing the Draw file into Illustrator to work on it there but all of the layers which were previously vectors, and didn't pixelise when I zoomed in, are now raster images, and become very pixelated if I zoom in, making it impossible to work on.

Does anyone know how to solve this? And sorry if this is a very obvious or easy to solve issue, as I said I'm new to the program

Thanks for the help in advance