TS3376 the application is working good, but the location of my device has found was totally wrong. any idea?

the application is working good, but the location of my device has found was totally wrong. any idea?

That would be the issue here.
The gateway is a modem/router that is in charge of your network.
The AirPort sensed this during setup and configured itself to operate correctly and passively with an "upstream" router on the network.....so, the Airport is in Bridge Mode.
The upside is that the AirPort is configured correctly to work with your gateway. The downside.....and Catch 22....is that the Guest Network will not operate correctly when the AirPort is in Bridge Mode. 
The AirPort has to be the router "in charge" in order for the Guest Network feature to work correctly.
If you want to try to break some basic networking rules, and have two devices both trying to perform routing chores on the network, that might be a workaround.  But, things get complicated to set this up.....and it will produce what is known as a Double NAT error on the network......which may allows things to work OK....or....cause problems.
Double NAT errors are unpredictable. It will be one of those things where you will not know if things will work until you try. No guarantees possible.
The network will have to be completely redone if you want to try this, and you will have to set up new Static IP addresses for devices that need them.
In general, if you want to try this, the network layout must look like this:
Internet Connection > SMC Gateway > AirPort Express > Ethernet Switch > Devices.
With things set up the way that they are now......the simpler thing to do would be to use the SMC wireless for your "main" network and the AirPort Express wireless for "guests". 
The downside....."guests" will be able to "see" devices on your "main" network with this type of setup.

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