Digestion problem. To develop?

I have been facing digestive issues(chronic type 6 stool as per Bristol scale) for years. I have recently(a month or so ago) noticed that when I consume gram flour or kidney beans or chickpea or pulses(like moong dal) or garbanzo beans(kabulichana), I develop constipation and have incomplete evacuation. And I have also noticed that in my case consuming pumpkin seeds(just 1tbsp) causes constipation and incomplete evacuation too. And when I avoid aforementioned foods, I have type 6 stool as per Bristol scale and don't have feeling of incomplete evacuation. I have bowel movements daily I don't have abdominal pain, cramps or vomiting. I had iron deficiency anemia in reports of a blood test taken in feb 2020. I have read consuming too much fiber can cause constipation but I don't think that I by any means consume too much fiber. What could these signs mean? Can something cause soluble fiber sensitivity or intolerance to develop? I don't have any underlying medical condition.