Hi guys, I've installed DOSBox.ECE but I can't set correctly aspect ratio as i've always done

the image is stratched in 16/10

fullscreen = true
fulldouble = false
fullresolution = desktop
windowresolution = original
output = opengl
autolock = true
sensitivity = 100
waitonerror = true
priority = higher,normal
mapperfile = mapper-ECE.map
usescancodes = true

frameskip = 0
aspect = true
scaler = none
glshader = true

What'swrong?