Hi, Cindi18, and thanks for reaching out. We understand that your iPhone seems to be adding a country code automatically. We'll be glad to help out.
If you use iCloud for Contacts, verify the number isn't being added at this website from a computer: iCloud
If you use any other account (like Google or Yahoo), be sure to check their appropriate websites to see if the +1 is being added.
Check which default account you're using by going to Settings > Contacts > Default Account. Make sure it's the desired account you want to use and hasn't been changed.
If everything looks correct and you're still having issues, try a normal restart of your iPhone: Restart your iPhone, iPad, or iPod touch - Apple Support
We hope this helps out.
Cheers!