Yes that is it.
I am familiar with the Patterson brand and stopped using it a number of years ago. It is a great product but I found that many of my patients complained of the same burning sensation that you are. The mint flavoring seems to be the main culprit in my experience. Does the cream fluoride bother you as well?
I would suggest that if the above is, in fact, the situation that you discuss this with your dentist and just use the cream possibly longer or more often.
If the cream fluoride is bothering you too then we have to look to other products from other manufacturers and this is a trial and error process.
Cheers,
Mike