Fresco export to illustrator distorts image

I have a 2 layer image drawn in fresco that im trying to import into illustrator to edit but although the PDF looks fine when opened outside illustrator or in preview, as soon as i open it with illustrator the bottom layer is completely distorted. I drew it with vector brushes and the fill tool and it looks like half the anchor points are there and the other half are missing so the fill is half missing. Short of importing the bottom layer as a png and using image trace (which doesnt work very well) I dont know how to fix it. Very annoying after spending hours drawing.