asterisk -rx "queue show"
Do you see that queue member there? IF so, you will also see it in fop2. To remove it, you must remove it from your queue, then fop2 will reflect the change. It is not something you do on fop2, the problem is in your asterisk queue, fop2 just shows you that you have it there.
You can remove queue member from fop2, or from the asterisk cli:
asterisk -rx "queue remove member XXX from YYY"
where XXX is the queue member and YYY your queue number.