What Causes Faecal Incontinence?

I ate a lot of curry, noticed I was leaking stool from my anus. I thought I was my vagina, until I used a anal suppository to poop and notice the color of stool was yellow and greasy. I am always constipated so I drank some mineral oil and had a fiber drink so am not sure if it is a combination of them all that is causing the anal leakage.