First, you can check and make sure your measurement load is in the requested range in doc that will guarantee the voltage level won’t be affected by measuring. And you can check the pin level of 1.8V side of level shift to check if the output 1.8V from module is correct. If no problem with your measurement, you can also check other pins from same level shift and other level shift to make sure it is a pin related issue or level shift issue. If you can confirm it is module or level shift issue, you can run RMA for the devkit then.