My chocobo was rank 10 with rank 11 unlocked (rank 10 with one star icon) with the use of a Thavnarian Onion and had 400k experience. Upon being discharged from FC with chocobo still in FC stable it was reduced back to rank 10 and lost the 400k experience.

Time: 5pm PST 9/5/2014
Frequency: Once (have not attempted to see if issue would happen again)
World name: Ultros
Character name: Silver Knight
NPC name: Housing Enthusiast
Monster name: N/A
Class/Level: N/A
Party or solo: Solo
In-game time: idk
Area and coordinates: Lavender Beds, Ward 3, Plot 10
Steps:
1. Chocobo stabled
2. Discharged from FC
3. Had to obtain chocobo from housing enthusiast npc at x 10 y 14 Lavender Beds
4. Stabled chocobo in new FC stables


Connection Specs
- Type of internet connection/provider: DSL/Comcast
- Modem maker/model number: