Sorry, I can't think of what is happening. Someone else here may be able to help.

My ribbon modifications for the past three years or so have all been by manual modification of the XML using the Office UI editor. If you are doing extensive modification, especially for more than one computer, I would urge you to tackle it. Customize the Ribbon (It doesn't take rocket science)

Such modifications are more powerful, more flexible, and more robust. Among other things, the same modifications work for me in Word 2007, Word 2010, and Word 2013. That is not the case with modifications made through the UI.