1.7 Currencies in Stats are mixed up in multistore

[karxix]

Hello,

we currently have a multstore setup on Prestashop 1.7.6.7

There are 3 stores:
- first store has currencies USD and LBP, with LBP as default (international -> localization), this is the 1st store created
- second start has USD, with USD as default
- third store has SAR, with SAR as default

If I go to stats->stats dashboard, the numbers are always in LBP
so if I am in the USD store, I see numbers in LBP but with the USD currency symbol
if I go to the SAR store, I see numbers in LBP but with the SAR currency symbol
They only show correct in the LBP store

The currencies & their conversion are defined correctly in the back office.
I believe the bug comes from the currency conversion rate, in the back office, the USD store, the USD conversion rate is the same as the one in the LBP store, if I edit USD in USD store, it changes also in the LBP store. So the data in the database is saved with conversion rates (it should be 1 for USD in the USD store, but instead it is showing the conversion rate to LBP)

Has anyone faced this issue before?