hidden form field value in ft:object

I tried to set a hidden form field value with ft:object, but instead of the 
value it's displaying a uuid without "-".

<cfset stPropValues = structnew() />
<cfset stPropValues.captchacheck = captchaHash />

<ft:object typename="farFeedback" lFields=
"subject,name,emailfrom,comments,captcha" stPropMetadata="#stPropMetadata#" 
stPropValues="#stPropValues#" lHiddenFields="captchacheck" IncludeFieldSet=
"false" />



If i dump the value of captchacheck i get:

captchacheckstring B2CBF1D64B40D3D020EA5918F6AA7C2C

Any idea's?

Thanks!

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