Which network server are you using? Please double check that the data is being forwarded from the network server to Cayenne. Check our docs section for more info.
We need to receive a packet of data before we can show any widgets (except for the map), so, depending on how often your device emits data, it might take a little bit for the for sensor readings to appear.
If you are sure that the data is being forwarded properly, can you please DM me your DevEUI so I can have a look?