I have no duplicates. I reached 463 while trying to capture the baby ape to finish that safari a week or so ago, and opened a ticket to a gm to see if they could help (obviously not, but luckily I was able to catch it the next day). He told me that I was at the pet limit at that time. Now I've reached 463 yet again and can no longer collect anymore
Edit: I'll open another ticket. Last time the gm said maybe there was a ui issue, before commenting that I was at the limit. Maybe that's just my problem..don't know how I'd fix that though. Just wanted to see if anyone else had this issue.