[nonplussed]

That's odd they would ask you to resign although 2 levels lower is weird.

I had something similar happen to me last year. When receiving an offer, I was told I would be at L6 but found out after I was hired at L5 (both levels are considered Senior Engineer). The title is the same and the comp was as agreed, just that I thought the level would be higher.

Lesson learned for next time. Always get something like that in writing.