That is odd, it works over here. The pylons them selves are fixed, the adapter however is not, it is called for in the inner weaponstations:
[LeftInnerWingStation]
SystemType=WEAPON_STATION
StationID=3
StationGroupID=4
StationType=EXTERNAL
AttachmentPosition=-2.05,2.74,-1.28
AttachmentAngles=0.0,-1.0,0.0
LoadLimit=1400
AllowedWeaponClass=BOMB,CGR,TER,RP
AttachmentType=NATO,USN
ModelNodeName=adapter_inner_L
PylonMass=10.89
PylondragArea=0.00
LaunchRailNodeName=
MinExtentPosition=
MaxExtentPosition=
that is why I added two new weaponstations, specifically for the sparrows, with no ModelNodeName so the adapters don't show up:
[sparrowWingStationLeft]
SystemType=WEAPON_STATION
StationID=17
StationGroupID=2
GroupLimit=4
StationType=EXTERNAL
AttachmentPosition=-2.05,2.74,-1.22
AttachmentAngles=0.0,-1.0,0.0
LoadLimit=1400
AllowedWeaponClass=SAHM
AttachmentType=NATO,USN
ModelNodeName=
PylonMass=10.89
PylondragArea=0.00
LaunchRailNodeName=
MinExtentPosition=
MaxExtentPosition=