Questions why this happen when i adding a new Profile Field ?

[Freesteyelz]

From what I've gathered you'll have to manually translate each option accordingly. Placing $post[field15] will only show the "binary" number. So there will be a bit of work if you have a lot of selections.

If for example you want to show the 4 options, "Serious Relationships", "Friends", "Networking" and "Dating" you'll need to set a conditional for each. Such as:

<if condition="$post['field15'] & 1">
    Serious Relationships
</if>
<if condition="$post['field15'] & 2">
    Friends
</if>
<if condition="$post['field15'] & 4">
    Networking
</if>
<if condition="$post['field15'] & 8">
    Dating
</if>

And so forth...

Check the numbers correctly. Notice that:

1 = Option 1 (Serious Relationships)
2 = Option 2 (Friends)
4 = Option 3 (Networking)
8 = Option 4 (Dating)

So options 5 would be "16" and option 6 would be "32". In post #3 the $comma is only if you want a comma placed after each selection when you allow multiple selections.

I hope that I've explained it properly.