If you're gluten intolerant, it's frustratingly difficult finding foods that agree with you. But if you struggle with corn allergies, we recognize your challenge is gluten intolerance X10. It is unbelievably difficult to find foods that aren't contaminated with corn in one form or another. The meat world is especially difficult, if not even more so. Simply put, if it's not fed corn while its alive, it's likely sprayed with corn after it's butchered. Just prior to being rolled into the cooler to chill, the whole carcass goes through a proverbial "car wash" and is typically sprayed with corn-based carcass wash (**a risk of glyphosate contamination as well) to kill bacteria on the exterior of the carcass. It's a practice similar to spraying a field to kill a handful of pest insects meanwhile killing the 1700 ish beneficial insects.
So, it is entirely possible to have a grain allergy reaction from 100% Grass Fed & Finished meat.
In addition, the carcass acid wash is naturally more concentrated in ground meats.
Here is a link to a typical carcass wash: https://www.spartanchemical.com/products/product/313305/#top