I want to send two CAN messages using my VN1630A vector box . each message in a different channel but It seems only one channel is working

I am currently trying to connect to a two ECUs which are identical, using the same DBC file, I am using the CAN pack, CAN transmit and CAN configuration blocks for each ECU.

Basically in this way

VECTOR VIRTUAL 1 CHANNEL 1 represents my channel 2 of my VN1630

VECTOR VIRTUAL 1 CHANNEL 2 represents my channel 4 of my VN1630

All the devices are correctly selected in all blocks, the following picture is just representative

When I run my simulation It seems that only one channel is working (CHANNEL 1), they work properly indivudually when I comment them out respectively. The scope of this model is to control the ECUs individually , using this model as a GATEWAY with my VN1630A using two pyhiscal channels.

Any idea why I am seeing this behavior?