I saw a few posts about icons turning grey.. Not sure what that means can someone explain

I have been getting the same consistent scores for over a month now and have been happy with my score, but I took a PT two days ago (two days in a row) and went down 4 points on both of these days..not sure why? i know for a fact im drained but im not too convinced that this is the reason why my score went down two days in a row exactly -4. what do i do up until the test day? I plan on taking two more practice tests (tomorrow and wednesday) but also nervous to see the same low score I got two days ago? i saw on a few forums that its normal to randomly go lower the last week before the lsat but i also saw on other forums that the last 3 PTs is a good representation of what I would be getting on test day