Do you know when this "exp chart" was lost? Is it possible this
information was lost over a week ago(and outside the reach of the
rollback feature) Is it a handout, information on a character sheet,
or something else? Was it accidentally deleted, seemingly randomly reset
to some initial value? If you provide more information about the
situation, we might be able to give suggestions. Stating the Campaign
name can also be useful if you approve of someone from Roll20 looking
into the game, if it gets that far.