Food particles, grease, or debris may be stuck inside the release valve, preventing a proper seal. You can remove the steam ...
Instant pot, Instapot, call it what you will ... but it's easy to overlook the sealing ring, steam release valve, and float ...
On older Instant Pot models, you needed to turn the valve to release pressure and then quickly pull your hand away from the gush of steam. Now, you can simply slide a switch near the valve.