After many tests with your Plugin and external QR generators I was able to find the problem. The problem is the domain extension and not its Plugin or QR readers.
Any domain that is encoded without a .com, such as .live, will be treated as text by the QR reader, giving only the option to copy the text. On the other hand, any domain that contains .com, .com.es, .com.uy, will be notified by the readers as a valid URL and giving the possibility to go to it.
