These tests only seem to be a way to weed out applications to a smaller number. They do not have the usual numerical score out of 100 or something. Though, you may get percentile scores sometimes.
By inconsistent, it means that you have answered differently to the same question presented in two or more different ways which is very common in these tests. I also think that people can easily fake answers to present their best "personality" in these tests.
Ideally, if these tests are to be done, the results should be evaluated in combination with an actual interview. If it didn't impact the application, it wouldn't be needed. Why waste resources on it? It is difficult to tell how a company may use it.