De-ranking with the new Progression Season System

I recently was de-ranked in MCC. All my unlocks are still unlocked but my rank is back to recruit. I was a General I believe and on Tier 30 when it happened. Is that normal? Is it a new tier and starts fresh again with a different medal color? Thank you guys, community and all.

You have completed Tour 1. Tour 2 has swords behind the bronze shield and when you reach Tour 3 the swords will disappear and you will get a silver shield. There are 11 tours in total.