This explanation does not match my situation. I am a retired railroad employee since 1/1/18. During 2019 I received a back pay check which had rrt1, rrt2, rrtm and fed/state taxes withheld. After I entered the W2 info and continue I receive a message that too much rrt1 was withheld and to contact my employer for a refund and a corrected w2. The amount withheld was 6.2 % and total wages were below the $132,000 max for withholding. If I contact my employer what do I tell them for the reason I am due a refund?
