Selected Answer
Robert
Not sure what's happing here. Cell N10 appears to have only one conditional formatting rule and (as you say) according to that rule the 81% value should give a yellow icon.
I cleared all the conditional formating from N3:N12 and applied a single rule with an icon set with Green >90%, yellow >75% and red otherwise. That seems to give the correct result for N10 (see attached file) but I noted that in your file you had rules per cell and sometimes the icon order was reversed (was that deliberate?)
Hope this helps.