This is one of the problems you run into when not testing chips and / or having test boards with one chip.

It is harder to make out the reason why the chip is performing not as simulated.

Then again, they seem confident that they will be able to get the unit working on the ordered pcbs, so the problem can´t be too big a deal.

Let´s see what the results of the more detailed analysing is, and we will all be wiser.