Regionalized Calculation active causes negative values [ecoinvent in OPENLCA]

Question

Hello there,

I'm doing a series of tests. I defined two simple processes in OpenLCA, and as location I defined "Portugal - PT". When I evaluate the Product system for "Land Use", using ecoinvent, I get the result of figure 1 (which seems ok):

However, when I activate "Regionalized Calculation", I get the same result but with a NEGATIVE value (figure 2). My question is: why the negative value if nothing changed except the regionalized calculation, which seems already accounted for without ticking the option?

Thank you in advance