I think they are all having problems https://github.com/zedeus/nitter/issues/983

I have nothing to back this up but I assumed it was due to federating everywhere. And calculating the actual total, dealing with duplication etc.

Would be great to see someone with a bit more know how chime in.

They did post an update about it

Looks like its less about blatant loli/shota content and more about “characters who are petite/young-looking but not obviously underage”

How and if that changes anyones feelings about it is up to them.