Be sure the door you are entering is the door you requested for delayed entry/exit. Typically only one door is given delay. If you are now entering through a different door, delay will have to be added. Also be sure the system is not being armed in the instant mode, which will not allow for any re-entry. If you are entering from the correct door and your system is not arming instantly, then there could be a malfunction with the door contact and service may be required.