Do these patties consist of only ground buffalo or have they added fat and/or seasonings to them? Do you have a lean percentage?
Most of the buffalo I've seen is above 90% lean, sometimes around 94 or 95%, although you can get it in the 80s too. The very lean buffalo is not great for burgers, in my opinion, unless you're willing to add some butter to the process or maybe cut it in with some less lean beef.
Best,
Michael