Why do I still feel my cycle through birth control wtf

I’m on a progesterone only pill called Slynd. It’s been great in a lot of ways helped with rage and insomnia .

However when I am having a hard few days , I’ll check the app and sure enough it’ll be the time I would be ovulating. But I’m taking it continually and haven’t had a period in 5 months lol why would I still feel ovulation!!!

It’s wild!!