I've used a lot of Dektol and have had all the colors mentioned. Normal is clear to pale tan, like the color of pine wood. I get the impression that your bag was damaged, and either BH or Kodak would replace it for you. I have no problem with light tan and I've used dark tan Dektol before. I believe I saw the dark tan give me an off-white "tone" to my paper as a result, so I dump it out. But my own stash of Dektol comes from several generations ago. I expect hit-or-miss. Your bag was fresh and should have been in good shape.
p.s. I work for Kodak but not in film or chemicals, so the opinions and positions I take are my own and not necessarily those of EKC.