Firewall alert says Tixati trying to receive connection from the internet? Why is this?. it is downloading something so isn't it receiving connections? Why would some ips flag the firewall?

TL;DR this is fine. You had better allow it, but things should still work if you don't.

With BitTorrent, you are both downloading and uploading whenever possible - you can carefully change this, but doing so is considered impolite and killing the system.
Also, both downloads and uploads can happen regardless of who initiated the connection. Some people can only initiate connections but not receive them. It's OK on small scale, but if neither you nor anybody else in the swarm can receive connections, you will not download the files even if someone has them, is online and you know that.