nested substitute giving me problems

[Doc_62]

So I put this formula in excel in e4 and I get a value of 1 for 1 in e3. I also get 2 for 2 but I get the correct results with 3 = 2 and 4 = 1.
=SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(d3,"1","4"),"2","3"),"3","2"),"4","1")
What am I doing wrong
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