Is Atlanta one tier below Dallas-FortWorth

Hi, Currently I have moved to Atlanta, GA from Dallas - Fortworth, TX and my LCA prevailing wage has increased a bit in Atlanta with same Role and Wage level that I had in Dallas-Fort Worth but my employer has reduced my base pay significantly (I should say drastically) and is claiming that they have adjusted the base pay since Atlanta is Tier C compared to Dallas as Tier B. My base is still above the LCA wage but my promotional hike and performance hike has been completely cut down due to this adjustment. I would like to know if my employer’s claim is correct, why LCA prevailing wage has increased in all cases for all wage levels in Atlanta if we check the wage comparison in FLC Data center.