Hi HappyDaize
Thanks for reporting this problem.
It's an oversight specifically related to cats which turn 7 days old. At that age, they switch from 4 hour sleep cycles to 8 hour sleep cycles.
That change was not taken in count in the cattery, hud & HUB for in-world cats. The system assumed the cat gained double the amount of energy while sleeping (as you can see in your screenshot) which would match 4 hours of sleep to reach 100% energy rather than 8 hours.
This display issue could last for up to 24 hours.
We created a workaround.
Regards
KittyCatS