Ah, that makes sense now! Thank you!

Hello, I'm fairly new to the game, been playing the last few weeks, currently playing as a level 49 Mercenary. Whenever I find a bounty hunter trainer, I click to see what mercenary things I can learn and there's nothing there. If I filter it by "show all" it shows a bunch of skills I can potentially upgrade, but it always has the minimum level set to one level more than what I am now -if that makes sense? For example, I was level 48 and the list of skills the trainer had showed they could be upgraded at level 49. Once I got to level 49, I went back to a Bounty Hunter trainer and the skill now shows I need to be level 50. Not sure if I'm just missing something or if I'm dumb