Okay, but if the problem is the position why not just move it ?

For this object I've made many improvements. Your revert wasn't just a "correct position" it's was a "correct position and erase all the improvements".
You shouldn't use the revert tools like this, without any discussion, for bad position correction, which is easy to fix without erase any information.

Did you read the CAUTION section of the Revert Plugin ? (https://wiki.openstreetmap.org/wiki/JOSM/Plugins/Reverter)

This requires you to respect a list of behaviour :

* **Do not revert changes by other users without contacting them first in a polite way** and giving them enough time to reply (one week minimum).

* **Do not be tempted to revert early**. When in doubt, **discuss things** on the mailing list before you act.