Property value group duplication

Hello all
Just to report a strange phenomenon that happened to my model: while transitionning system functional scenarios to logical (which induces owning capacity transition as well, functions were already through the activity explorer tool), some of the PVG were multiplied by about 50… kind of for each transition.
Additional information about my model: These PVG apply to system function instances, executions and operands. They are stored in a folder just under the model top (two steps under the aird file). They describe the required variant attributes, functions own a copy applying them as well. function OPVG apply to components. Components own a second copy. (In some cases, several required variants are played by the same function variant, and again for components.).
Thanks for any information.
Please raise or tell me to do it a concern in github if useful.
Regards Thierry