SouthernCross78

I find that your own trade ships leaving your gravity well gives you culture and tax increase as well, quite odd.

Oh I missed out one more thing. Other than the culture bug, you will get this across all planets TAX INCOME : 20%

After expulsion is researched, it messes with your culture. I had two temples giving me a culture rate of 10, it drops to 0.7 after expulsion is researched. After which if you pay close attention to it, you can see it flipping between 0.7 & 10. In short, culture is if expulsion is researched.