I'm new to the forum as well as owning a Jeep. I've had mine all of 2 days and I just noticed this. I don't think I ran over anything but I didn't notice it until today due to some vibrations/wobble feeling.
check the tire codes on the sidewall to see what the mfg year is. They may just be old.
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2003 RED Jeep Wrangler X - Can't stop adding stuff and updating.
2014 White Jeep Liberty Sport
2011 Carbon Black GMC Yukon Denali
2007 Black GMC Sierra 2500HD 4x4 Duramax/Allison
2007 Keystone Laredo 284BHS TT