WAN priority confusing

How come that RX on the second source is active? I thought that priority should be on source one as long as its up n running.
Source two is the SIM in the router.

Hello,

Please choose the right category under the required field. The question is related to “Network” category, and the question is posted under “Telematics” category. The concerned Engineer from Network department will address the question.

Thanks,

BR

image