Downloading as pdf

When I am downloading a file I have created using AdobeExpress, the format is all messed up in the download, which is not the case in the editor. This is a new issue as I have downloaded many pdfs in the past and not experienced this before. E.g. things are bolded where they shouldn't be, text boxes are out of place. This doesn't happen if I save as png, but I want to be able to save as a pdf since it is a document.