Leaky Gas/Oil on the passenger side by the coils/injectors
 

So for context, I recently bought all new ignition coils for routine maintenance. When I was changing 1-4 (passenger side), I noticed what looked like dried oil residue built up. I noticed that towards the back near cylinder 4, it was less dry. I started the vehicle and felt around for a leak, and I immediately noticed that gas was leaking from the Shrader valve and landing around my fuel injector all the way in the back. I removed the valve, took it to NAPA, they fixed it, and assured my the oil residue was likely just fuel. I popped that injector out to clean around it and install the new coils and I wiped down the area. I tested the truck and sure enough the Shrader valve is not longer leaking. At this point I move to the other side to install those coils and call it a day.

I've checked it every day since, and not right away, but now after about a week I'm noticing residue again and that last fuel injector #4 has moisture evidence around it. I'm unsure if this is gas leaking from the O-ring, or if oil could be here for any reason. For reference, the injectors I replaced about 7 months ago and they all have new o-rings.

Here is a video of the oil/gas leakage and some pictures. I'm having a hard time finding the origin of the leak.
https://cimg8.ibsrv.net/gimg/www.f15...454596c446.jpg
https://cimg0.ibsrv.net/gimg/www.f15...1d7010f33c.jpg
https://cimg1.ibsrv.net/gimg/www.f15...888d7d2ec9.jpg
https://cimg2.ibsrv.net/gimg/www.f15...599a6aafc8.jpg
https://cimg3.ibsrv.net/gimg/www.f15...a2a7981410.jpg

Maybe one of the new injector O-rings is not seated properly.