Appearantly the issue in your spf record cauysed the test mail not being received by the spam test tool. This is an external tool. When you click on the details button it will show you the report, but at that time the spam test tool is still waiting for your mail that was not coming in. That's why the popup remains blank.
To improve your mail deliverability it is extremely important you have configured your spf, dkim and preferably dmarc records configured correctly.