I have noticed the same thing the last month. I was putting up 250+ on O consistently and had 20 stars in last months cwl(usually get 17-19 stars per cwl). This month I'm struggling to get 170 on O and had 14 stars in cwl. On D I'm getting crushed. Been noticing you use a certain army in legends and you tend to get anti that army bases so you switch armies and then get anti that army bases. It definitely doesn't help with now bad warden and queen ai are.