The hexadecimal string representing the armor color doesn't have any preceding 0 characters. Although this is a valid hexadecimal string, it is not a valid RGB string since it does not have all 6 characters.
Example:
The following command gives a pair of blue (#0000FF) leather boots. However, the color is instead displayed as #FF.
/give @p minecraft:leather_boots 1 0 {display:{color:255}}Attachments
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