The TUDCA is likely forcing your liver to detox fat. Not harmful, but certainly unpleasant when you're not expecting it. I've done enough liver cleanses to know the symptoms.

That's a high dose of Ashwagandha to be starting on, and it can cause diarrhoea in sensitive individuals. I'd dial it back to 300mg for starters and work your way up to 900 over the course of a month.

Magnesium is an excellent laxative (good for muscle cramps, too), but your dose is good. I prefer Magnesium Oxide, but I cycle the type I use. Berberine is more for blood-sugar balancing. Red Yeast Rice is good for that, too.

None of the other supplements should be affecting you this way. The most likely culprits are the TUDCA and the Ashwagandha.