It could if there isn't enough oxygen getting in. I use a BGE vent too on my UDS. What I do it, make sure my outlet vent is wide open and let the charcoal burn until there is no white smoke. Then, i crank back on the inlet until it I get the temp I want then I put on the meat. Keep that outlet wide open.
Jambo Pit - UDS - Lang 60 (Sold)
18.5" & 22.5" Weber Kettles - Smokey Joe and Mini-WSM - Bubba Keg - #2 La Caja China
Impeccably Accurate BLACK & RED Thermapens
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