With long range radio, other nodes obviously don’t need to be close to your gateway. But as all payloads are 25 bytes: can you confirm that all packets you’re receiving match the times that your node is sending? (Or did your node only send at 19:44:46?)
Unless all different DevAddr lines are in fact your node: receiving transmissions on a gateway but not in an application often means that the keys are wrong. I assume you added the node (device) to the application in TTN Console? Also see Hex, lsb or msb?