well whomever did your balance, did not do a "road force" test. It will position with the right counterweights where to position the tire (i.e. LF, RR). Unless you have bent your wheel which does happen. When they balance your tires with a hunter machine, if you see them putting more than 2 weights per side, that will raise a flag right there. Im not saying you bent your wheels, but it can happen from time to time or they just dont have the right adapter and not paying any attention on the machine.
2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille