I suspect it's something along these lines, that the OPs salary and title somehow aren't lining up. Either what you describe or the opposite where their salary

I suspect it's something along these lines, that the OPs salary and title somehow aren't lining up. Either what you describe or the opposite where their salary was higher than their level specified and the offer letter was fudged. The former is probably a good situation to be in. The latter is less good as even if one gets the promotion to that next level, if you're salary is already in that band you won't see a corresponding pay increase.