Doesn't hydrogen have one energy level assuming that we only have one electron and not an ion?

It may have one occupied energy level at a time since it only has one electron, but overall it has several energy levels.

Yes, Hydrogen has one energy level, (an S sub-level that can fill up to two electrons).

The only other confusing thing about Hydrogen I can think of, is that you will almost never find it existing as a single Hydrogen, but as H2 ...