How can the computed width style deviates so much in internet explorer?

HTML & CSS
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6

The simple way is to change the CSS style further down the cascade to some other unit which will overwrite the initial style.
.FormField { width:some-other-unit; }

Here is a link to a conversion table showing several units and the relationship between them.
pt-px-em

As @ronpat has stated, the result is browser and screen dependent and may not give you the width you are expectting.

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