Html or MyCode in Custom Profile Fields

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It is because (I think) there is a htmlspecialchars_uni() there. Maybe you can remove it (by using the plugin, the customfields use the parser options).
Do that (use the parser options) in your function_post too for postbit.
As usual, just be careful for allowing HTML there.
I think (only my personal opinion) it is better to do that per Custom Profile Fields rather than general settings.