Hi,Yvette Drager. What QR Code barcode generator did you use. The problem may be caused by your barcode generator. You can change another barcode generator to have a try. To do this, you can Google "Java QR Code barcode generator with guide" and many useful and professional sites come out for you to choose. Good luck.
now qr code has been widely used to add links on it, so it will be easy to open links. with professional java qr code generator, qr code can be quickly added with links to Moodle site resource. and convenient to scan qr code using java in phone or other devices.