That's not normal. You might have torn/pulled something. I'd proceed with caution.
There's something to be said about antinutritional factors in plant proteins (eg. trypsin inhibitors, phytates, tannins etc) and bioactive peptides in milk, specifically undenatured whey concentrate.
The antinutritional factors can be largely mitigated during preparation and the effect in young, healthy persons probably isn't significant, but that changes depending on population
Antinutrients are a class of compounds that inhibit the absorption of nutrients. There isn't anything healthy about them. Perhaps you mean to say they are present in most plant foods, which have a variety of benefits.
Antinutrients — not a reason to avoid plant foods. They are a reason to reconsider dietary choices if you have health conditions where specific antinutrients may increase the risk of aggravating said condition. And a reason to reconsider using blanched soy beans as a major source of protein.