Hello, I've been having this problem for a long time, while about 6500 organic people from Pinterest visited my website, this number dropped to 1700 in 3 months. There is a problem and no one is answering. These notifications need to be forwarded to the pinterest support team for the issue to be resolved. But we don't know if the moderators here are doing this. We can't get a response from pinterest support regarding this issue. It just says that there is no spam filter on our account. I post pins daily but it's getting worse every day.
I am having the same issue. Mine dropped to zero- absolutely no analytics at all! Its been this way for several months. Ive looked everywhere and cannot find a solution.