What causes semi-runny diarrhea that has an orange or brown pigmentation?

Hi doctor,

I have experienced semi-runny diarrhea that has an orange or brown pigmentation. It is not bloody, nor contains mucus. I passed this when I woke up at three in the morning because of something, and before going to sleep I had experienced some stomach aches but ignored them and slept through. During breakfast, I had eaten a yellowish curry type of food. I had a couple of snacks midday which contains an extremely red pigmentation and also a bag of puffs which contain an orange pigmentation. I then had brown rice for dinner before the stomach aches began. I also drank a drink made from a mixture of water and a red syrup a few times during the day, though not many amounts.

The only medication I am taking now is Amoxicillin (bad sore throat, recommended by a doctor), and I also have slight acid reflux so the intensity of the snacks may have not done well. What is the cause of my extremely orange diarrhea? It is like a copper-orange and brown color. I am 18, female, 5’3" in height, no records of this before.