Retainer de-level

Time: 5:13pm 03-20-15
Frequency: Once
World name: Faerie
Character name: Fiona Foxglove
Retainer name: Vincy
NPC name: N/A
Monster name: N/A
Class/Level: Level 60 Fisher
Party or solo: Solo
In-game time: Not sure
Area and coordinates: Jeweled Crozier, x:8.2, y:10.9
Housing:N/A
Steps:
1. Accepted return venture, retainer leveled up from Fisher 50 to 51.
2. Immediately opened View retainer attributes and gear.
3. As soon as page opened, retainer went from level 51 with full 50 gear to level 29 with different, seemingly random gear.