Packets lost on Open Mote - B module

Hello, I have been working with OpenMote B module, configuring a Fan Mesh network with a border router(gnrc_border_router) and two sensor nodes(emcute_mqttsn). I have a problem when trying to connect the border router and the tap interface with ethos, many packets are lost between the ethernet interface and the tap interface. That is, when trying to connect from the border router to the tap and vice versa. Would you know why it happens or something would be configuring wrong?

This is a capture from Wireshark, when i losing packets