LoRa Difference between API and NodeRed

Hi guys,
I’ve recently been trying to create an IoT project and I’m using an MTCDT 246A gateway.
I set up several techniques to retrieve the Lora packets sent by my sensors.
I tried via NodeRed and via the API at https://myip/api?fields=lora/packets/up and I send the data to a database.
Unfortunately, I have seen many differences between these two techniques.
Via NodeRed everything looks good, I get 1 value per minute, but via the API I’m missing some information (which NodeRed has captured)
My choice is still to use the API because it is easier and faster to set up.
Is it a bug in the API not to give all the packages “up” (because the packages get confused with the “down”)?

Thank you