I agree with @RMJ and unfortunately different celiacs have different trigger levels for gluten, and some celiacs have little or no symptoms at all when exposed to gluten.

In people with celiac disease, gluten can trigger migraine headaches, and we have a category of research summaries on this topic: https://www.celiac.com/celiac-disease/celiac-disease-amp-related-diseases-and-disorders/migraine-headaches-and-celiac-disease/ 

They are made in a dedicated gluten-free facility, but anything is possible. It looks like their product contains Xanthan Gum, is it possible you have issues with Xanthan Gum?  https://www.maninis.com/products/4-cheese-tortelloni/ This article might be helpful:  

ABP2025, there are no definitive diagnostic tests for NCGS. It is arrived at by first ruling out celiac disease despite continuing symptoms from gluten ingestion.

So keep eating gluten daily, lots of it, until all celiac disease screening is completed. A negative biopsy would not rule out NCGS. Approximately 10x more people have non-celiac gluten sensitivity than have celiac disease, but there isn’t yet a test for NCGS. If your symptoms go away on a gluten-free diet it would likely signal NCGS.