I am having a similar problem - I only access TV Anywhere from the same laptop but it was constantly not recognised to now 4 of the 5 device slots are taken up by the one device...and its not letting me watch, saying it doesn't recognise the device/there's already 5. Here is a screenshot to explain:
I'm having a similar problem, I only access TV Go from my iPhone and my computer but my phone and computer are each showing twice taking up 4 of my 5 device slots when in fact it should only be taking up 2 slots. For some reason I am unable to remove any devices as I can't seem to find any option to do so.
I also have this issue where due to Firefox browser issues with viewing TV via the browser requiring me to delete cookies and history, the system sees this as a new device each time and I have now reached the limit of devices with 21 days before I can make changes to the remove the multiple copies of My Computer - Mozilla Firefox. Please see attached screen shot. I need to get these removed/reset so I can view TV in my browser on my other laptop.