Sometimes orders are created that are not Test order

[improv]

Hi.

We develop the app uses the subscription API.

I have the payment settings set to test mode.

However, it seems that sometimes orders are created that are not Test order.

For example, the following order does not created as Test order. 

gid://shopify/Order/5202990661940
gid://shopify/Order/5203735544116
gid://shopify/Order/5203725877556

Why does this happen?

Thanks.