2006 is a messed up year on reverse, looked in vista variety and wexlers, cant find. Two extra feet and column is my thought
Copper plated zinc cents have many weird issues. Worn dies are the culprit. Not all minor issues are listed (documented).
Can’t tell for sure but check this out: http://www.coppercoins.com/lincoln/diestate.php?date=2006&die_id=2006p1dr023&die_state=mds
Check all the pick up points,(pups). See if you can cross reference it to Wexler’s.http://doubleddie.com/ Let us know what you find!
Being zinc it will probably rot away soon. It might be a minor error but it's a plating issue that's common on Zinc.