The Fitness Level test is validated against golden standard VO2Max tests and on average it is accurate to estimate Fitness Level in most individuals. However, if for some reason the heart rate or speed data has been inaccurate during the test, the Fitness Level may also be erroneous. Furthermore, if the terrain has been containing a lot of uphill or downhill or if your speed has been very varying during the test the accuracy of the VO2Max estimation may be compromised. Also, your real fitness level does vary depending on external or internal factors, such as tiredness etc.
Please repeat the tests as instructed and see if the result changes. For most accurate results, repeat this for a couple of times while you are training.