what is CL in DMG supposed to mean

[Trenloe]

For some reason the druid is set as Caster Level CL 3 in the spell class while the cleric is set as CL 2 even though they are both max Cast Level 2, Character/Caster Level 3. Isn't that supposed to be incremented automatically when you level up? No multiclassing feats.

Not sure what you're referring to here. Could you provide more details please? Screenshots, steps taken to reproduce, etc..