A way to go back a level?

I know it's a bit weird to ask but my Cleric + Sourcerer leveled up but ended up taking 13 levels in cleric instead of 6 to balance it out to level 9. Just making sure: Is it possible to undo the damage after post or will I have to stick with making a new character sheet for my cleric to transfer most of his stuff but still go through parts of charactermancer to quickly build up?

Everything about the sheet is editable.  There isn't an automatic way to "remove a level", but you can look up what would have changed for that class level and change it back manually.

Wow... I wish I could accidentally take 13 levels instead of 6 and slip it past the DM. That's one big rounding error!