Are you using a front end?
99% of problems like this come from people using old or simply bad front ends which make a mess of the Supermodel.ini file.
There is no official GUI, only fan made ones.
(Trust me. I'm guilty of making bad GUIs myself

)
Make sure your Supermodel.ini has,
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; Light guns (Lost World)
InputGunLeft = "KEY_LEFT" ; digital, move gun left
InputGunRight = "KEY_RIGHT" ; digital, move gun right
InputGunUp = "KEY_UP" ; digital, move gun up
InputGunDown = "KEY_DOWN" ; digital, move gun down
InputGunX = "MOUSE_XAXIS,JOY1_XAXIS" ; analog, full X axis
InputGunY = "MOUSE_YAXIS,JOY1_YAXIS" ; analog, full Y axis
InputTrigger = "KEY_A,JOY1_BUTTON1,MOUSE_LEFT_BUTTON"
InputOffscreen = "KEY_S,JOY1_BUTTON2,MOUSE_RIGHT_BUTTON" ; point off-screen
InputAutoTrigger = 0 ; automatic reload when off-screen
InputGunLeft2 = "NONE"
InputGunRight2 = "NONE"
InputGunUp2 = "NONE"
InputGunDown2 = "NONE"
InputGunX2 = "JOY2_XAXIS"
InputGunY2 = "JOY2_YAXIS"
InputTrigger2 = "JOY2_BUTTON1"
InputOffscreen2 = "JOY2_BUTTON2"
InputAutoTrigger2 = 0
If it already has that, try downloading a fresh official build,
https://www.supermodel3.com/Download.htmlkeep it separate from your current install, copy the game zip to the new ROMs folder, and try launching the game with a batch file or command line using,
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Supermodel "Roms\lostwsga.zip"
If that works either your old version of Supermodel or front end is bad.