Dont want to sound silly but what is this brown plug circled in red below and is it supposed to be poking out?

Ive seen some of other member's engine bays and that brown plug doesnt poke out like mine? Its also preventing my ecu cover from sitting flush..

Ive seen some of other member's engine bays and that brown plug doesnt poke out like mine? Its also preventing my ecu cover from sitting flush..
