you set up 2 reserved slot and they're hidden.
check your amxx.cfg for
Code:
// Amount of reserved slots (for more details see comments in a plugin source)
amx_reservation 2
and change that to whatever you like.
i'd suggest you use another plugin for the reserved slots than the normal included one.
then you can have 1 slot reserved, but all admins can join as another player will get kicked when an admin joins.