Remove the Spectator List plugin. I shall explain why below:
Before I start explaining what the actual problem is, I need to explain how stuff work inside those plugins. In AmxModX there is a thing called HUD Messages. That allows plugins to show text anywhere on the screen as HUD Messages. HUD Messages has 4 channels, each channel can hold some text but you cannot show two different texts from the same channel. If text A is showing on channel 2, and then another plugin requests to show text B on channel 2 as well, text A will be removed and text B will replace it. Now that I explained how HUD Message work, I will explain the real problem.
UltimateJailBreak uses a set channel for different things so you can have different texts on the screen at the same. For example, on the top of your screen there is a message that displays what day it is, the number of the day, as well the number of Ts, CTs and the commander. Another example is the HUD health that displays your accurate health (even if it is above 255). Now on to the problem, the Spectator List plugin displays an HUD Message on the top right of your screen including the names of all the players that are spectating a certain player. The problem is that Spectator List needs to keep refreshing the message so the accurate list of players are shown. I have not looked at the code of that plugin but I am guessing it refreshes itself every 0.1 seconds, that's 10 times a second. I am also guessing that the list is not using a set channel for the text, but rather letting AmxModX choose the next channel on the list. When that happens, AmxModX will loop through all channel starting from 0 to 3 and so on. And since the the message is displayed 10 times a second, it is canceling other HUD Messages such as the top text that we talked about earlier.
Spectator List does not offer any important features and can be removed with minimal effect. While Spectator List is installed, it is hard for the Commanders to know how many Prisoners are alive, it's also hard for the players to know there accurate HP on special days, ... etc