Jeep wrangler leaking water on passenger side when going through a puddle?

So today I went through a mud puddle and when going through it i found that water had leaked inside under the passenger side dashboard. The door was completely closed and there was no water on the drivers side. the heater nor air-conditioner was on. What could be wrong?
it had rained the prior day, The mud water was up to at least the running boards. I doubt its the door seal because the water was coming from underneath the dash
 
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