Before applying any spatial filters, you can download a table to see if the data is in the correct coordinate order. If the data on the WFS server contains thousands of records, use the Max Features preference described under Setting the Number of Records (Features) that a WFS Server Returns to limit the number of records that the server returns. This lets you test a small subset of the data and avoid long download and processing times. If the coordinate order is incorrect, then on the TABLE tab, in the Maintenance group, click WFS Refresh to fetch the data switching the coordinate order.
Once you are happy with the coordinate order, on the TABLE tab, in the Maintenance group, click WFS Table Properties and disable or change the Max Features value and add a spatial filter.