An uneven light means the foot of the cigar has not been completely and evenly lit.   This condition can cause the cigar to burn irregularly, which will result in an unintended flavor profile.

CAUSE

Carelessness, wind, and/or construction problems.

REMEDY

An uneven light should be corrected quickly to minimize the negative effects.  The cigar burn can be corrected by re-applying a flame to the unlit tobacco, and puffing on the cigar.