Connect a signal to a PCI 6225 board and a PCIe 7842 board at the same time

[adenage]

I have a signal from a pressure sensor that is converted from 4-20mA to a 0-10V signal with a Phoenix contact MACX MCR-UI-UI-NC.

This signal is connected at the same time on an AI from a PCI 6225 board and an AI from a PCIe 7842 board.

The two boards are connected with differential.

When we read the measurement from the boards, we have inconsistent measurement on the PCI 6225.

For example, if I have 5.8V (read from a voltmeter on each card), I read in my application 5.8V on the FPGA board but 10.7V from the PCI 6225.

If I unconnect the FPGA board, I read 5.8V on the PCI 6225.

I have connected my signal:

-     On the PCI 6225: AI35+ and AI35-

-     On the PCIe 7842: AI0+ and AI0-

I used this as reference:

What did I do wrong?