You need to fill out that form. They’ll probably want all of it filled out, but at least the first half:

When submitting a bug report, please use the below template and thoroughly fill out the necessary information.

Date & Time:
Frequency:
World name:
Character name:
Retainer name:
NPC name:
Monster name:
Class/Level:
Party or solo:
In-game time:
Area and coordinates:
Housing:
Steps:
1.
2.
3.
*Add more steps if necessary
Just don’t fill in the stuff that isn’t necessary to the issue, like Retainer Name, NPC name, or Housing. The information you have to provide is fairly straight-forward: Character Name, Frequency (how often this bug happens), World name (your server), Monster Name (so, in this instance “Holy Cow”), Class/Level (whatever job you are, and what level it is), Party or Solo (probably “Party” since this is Pagos), In-game time (what time did this happen), Area and Coordinates (Eureka Pagos, plus the location’s coordinates), and then Steps is just detailing the error/bug that you have seen (he isn’t changing his appearance).