Thank you MATTGUO for your reply. I remember you helping me in the past, so I have great hopes here!
I understand what you mean re. the sources of the problem. We're using FIFO. I did run an inventory recalculation yesterday and closing (it was our month end), and it didn't change anything.
Here is what I get when dowloading the Inventory Value Report, after recalculation and closing yesterday:

This image shows 2 things:
1- We have several items for which there are no physical/financial quantity/value, but the system displays a line in the inventory. For exemple, items 101860, 100511 (batch R13058), etc.
2- We have several items for which there are no physical/financial quantity, but the system displays a financial value.
Regarding checking the inventory dimensions, could you explain more what you mean and where to look at?
Is there is a place where I can also check quickly about physical/financial dates? I can run a transaction movements report, and I believe it will work.
Many thanks!!