Hello Ya_Yeye_yoyo,

I see that you're creating a lot of Multipolygons that only have outer ways.

I'd advice you to stop creating as many unnececary Multipolygons and just stick with using regular closed ways whenever there are no inner members. 

Having Multipolygons that share the same outer ways tends to make maintaining the data a lot trickier and makes them more prone to breaking.

Best regards,
Taya Snijder