stroke scaling whilst enlarging a design that has been grouped, outlined and converted to live paint

hi there, 

i have a question. 

i have set a stroke width of 1.2mm on a design. 

once i select the design and then enlarge it (even though i have the stroke scaling switched off) it looks like the thickness of the stroke has grown.

photos attached:

notice the stroke width detailed on both photos are 1.2 mm 

the top photo shows the design after it has been enlarged (with stroke scling turned off) 

with a new line created at 1.2 mm ( which all lines ont hr design were before enlarging the design) 

that is clearly smaller than the original lines. 

just trying to figure out what is going on here.