Incorrect conditional formatting

Hi folks,

I'm having some difficulties with conditional formatting of attendance %ages

The rules I wish to apply are the following:
> 75% attendance = green
>=65% & <75% = orange
>=50% & <65% = red
<50% = black

In the attached spreadsheet, I have managed to do this with "format only cells that contain", but I wanted to make use of icon sets which are nicer

With the icons, 6 of my 18 results are incorrectly formatted and I have no clue why...

Any suggestion would be highly appreciated!

in traffic light format
change the type from Percent to Number and change
75 as .75
65 as .65 and
50 as .50