You need to make sure the 2ns track you created in Logic is 1. Using a different Channel strip and 2. has a different input in I/O section of Channel strip and 3. Your audio interface has at least 2 inputs!
Your problem sounds like you created a track connected to the same channel strip.
It's a good idea to learn the basics of Logic. I recommend a company called macprovideo. They have very good and easy to follow video tutorials for Logic and others. the Core Logic 101 is the one to look for.
You can download them or get online access to all tutorials by subscribing. I got a newsletter with a deal last week - 7 days free online access and then you continue with a subscription. Looks like you can cancel before then if you want. Well, it's a no brainer:
https://www.macprovideo.com/trial/?st=7df&login
deej
