the problems lies on 'else if level = 2 or 3 then expertise = 'Medium'; '
'if level=2 or 3 ' should be explained as 'if level=2 or if 3' which equals to 'if level=2 or if true' which means this condition is always be true. So any value of 'level' other than '.' and '1' will fall into this category. Remember, like other programming lauguage, SAS will interepret a number ge 1 as 'true'.

The original intention of this code should use the following code ' else if level = 2 or if level = 3 then experience= 'Medium‘’

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