Hi Lio,
It probably gave the same message when you
saved the new filesystem the first time, only
now you are paying closer attention.

Anyhow reinstalling the old filesystem won't
cause anymore harm, it would seem most likely
to fix it (if that's indeed the problem).
Also, make sure you didn't bump around the
partition size a bit by accident (I've done
that before!), if so restoring it to the exact
same location should cure it.
Good luck!