So basically, if a machine runs TOR and bitcoind at the same time, without me making any configurations to the .conf file, it will by default be on the TOR network?
So is my node a combination of IP and TOR? Under what circumstance would someone opt for this?
Normally not, no, for instance in my guide here:
[Guide] FULL NODE OpenSUSE 15.3: bitcoind + electrs + c-lightning + RTL, I install Tor to run the Electrum server and Core Lightning over it, but Bitcoin Core runs over clearnet IP.
I suspect you just still have some onion connections due to your prior config. Completely disabling Tor would be a quick fix and the most we can do with the little information you provided about your previous install.
You can definitely configure your node to run IP and Tor. You'd get the benefits of censorship resistance through Tor while at the same time having fast IP connections. Such nodes are also required to kind of tie the two networks (IP and onion Bitcoin networks) together. Otherwise a block mined by a miner who only runs an IP node, wouldn't reach onion nodes.