You can only deploy one level 8 resonator per portal, per agent. Can you send a screenshot of what you mean? Most likely the agent used a Flip Card to change the orientation of a portal with multiple 8s already on it. That is the only scenario (outside events) where an agent can have multiple 8s on a portal.
Edit: there is also a way to make this happen with Very Rare Battle Beacons but only in specific circumstances.
Isn't it when one uses a flipcard, the person has to wait for one hour to flip it back? Possibly multiple persons using one account or multiple account user/s.
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You can only deploy one level 8 resonator per portal, per agent. Can you send a screenshot of what you mean? Most likely the agent used a Flip Card to change the orientation of a portal with multiple 8s already on it. That is the only scenario (outside events) where an agent can have multiple 8s on a portal.
Edit: there is also a way to make this happen with Very Rare Battle Beacons but only in specific circumstances.
As @ArkFang said, it's almost certain that this was done by using a Jarvis Virus or ADA Refactor.
Or they are using multiple accounts.... Are they all belonging to same person?
Isn't it when one uses a flipcard, the person has to wait for one hour to flip it back? Possibly multiple persons using one account or multiple account user/s.
They did say 'an agent'. It wouldn't be a question of 4 agents deployed. This is just the weekly misunderstanding of ADA and JARVIS weapons.