Hi,
As I said, you need to go in the menu System>Order statuses. There, you'll see the statistics column I'm talking about:
monosnap.com/file/BdJ3hxUQl5tIhVdg4v0ReSg5ztXPaL
And as you can see in your last screenshot, all the orders have the status "created" which isn't taken into account for statistics by default. So you need to enable the "created" status under the "statistics" column as explained above to get the stats you want.
Regarding the error messages you have with the legacy dashboard, it indicates that some users have been deleted even though they are recorded in HikaShop and thus when it tries to load their information, the Joomla library displays that error.
I would recommend you to run a MySQL query in your database like this:
UPDATE #__hikashop_user SET user_cms_id = 0 WHERE user_cms_id IN(1196, 1178, 1172, 1151, 1625);
That will unlink the users in HikaShop and the messages won't popup.