Got something weird going on this morning

500+ peers out, what could cause this?

I might have this backwards, but it would seem the OUTbound connections could only be established by the hosts listed in your mainnet-topology.json file. The INbounds would be those who found your IP in their mainnet-topology.json file and reached out to connect to you. It almost sounds like your mainnet-topology.json file is huge. Maybe too many hosts?