Storage space on OBS farm

Another player in my Coop has 1700 storage space on the OBS farm. I myself have only 400 and wonder the difference?
None of us have a barn.
None of us have a barn.
For comparison, we have:
Plots of land: 8 pcs / 9 pcs
Adventure cabin lvl. 1
Cabin lvl. 1: 5 pcs. / 6 pieces
Mark lvl 1: 5 pcs / 5 pcs
Mark lvl 2: 0 pcs / 1 pc
Feed kitchen lvl. 1
Storage tents (deco): 4 pcs / 5 pcs
0
Comments
As you both have no barns and same level Adventurer's Lodge we cannot currently explain it
Someone else might have an answer but I will definitely ask the CMs tomorrow if no one else finds an explanation first
We also have a translation problem
Though I do not think it relevant.
Maybe you can answer another question, if I buy a field or a building for gold, can I then upgrade it for dollars afterwards, or do I hang on to gold the rest of the way?
As a general rule of thumb something bought with gold is upgradable only with gold
The GGSWiki, see button below, lists the upgrade costs of everything known