Unable to get mutations from nesting

Around 20-40 minutes ago, I nested my main ~7-10 times on my alt account with lvl 3 mutation nest, didn't get a single mutation. I find this odd as when I first started nesting, I got mutations fairly often (at least 70% of the time). After ~2 days after I discovered nesting (around 3-4 days ago now), I completely stopped getting mutations from nesting. I've tried this in the past 3-4 days too, maybe around 10 times, and also got no mutations. I also nested my alt on my main, and it got 2 mutations first try. My main was mostly on mobile but I also used my computer a few times while getting nested.