Nostalrius Begins - Quality wow vanilla realm (1.12)

Hi! I ran into a bug while leveling up my leatherworking in Ironforge. While crafting an item, I had the trainer tab opened and was clicking the train button a bunch, expecting the 6 or so new recipes to be bought in a row. Instead it ate my 65 silver and I didn't learn any new recipes.

Had the same problem but found that if I clicked the skinner to train and then went back to the LW trainer, everything worked. Do this everytime you want to train.