The sickness icon is not updating properly. The player will be perfectly healthy with the sickness icon permanently on screen. The sickness icon will also sometimes not show up at all while the player is sick. After logging off and on the server the sickness icon will correct itself but only after leaving the server. This problem seems to be the most noticeable on the new map Nasdara with the heat stroke illness.

Just obtain the heat stroke illness and it will either not update the player or the icon will never leave even after recovering

For sickness icon to be accurate