Major social networks constantly upgrade their hidden tracking scripts to catch folks running huge clusters of pages. A simple cache overlap could literally nuke all your active boards in seconds. You might want to review how to create multiple pinterest accounts and manage them securely here:
https://gologin.com/blog/multiple-pinterest-accounts/ . That post lays out the exact blueprint to make every session look like a completely separate visitor. The moderation system will treat your various photography collections as entirely unrelated users.