The score system
First let's talk about how the score system works, many people are confused when their score goes down. Our scoring system is very dynamic which means the score impact you have by writing a review for other people has different factors to it on how it will impact them.
For example, lets say you review someone with a higher score than you, the review will have less impact. The other way around it may have more impact on the recipients score.
Let's say you write a review for someone and in the weeks after you've reviewed them you lose score. Because your score will now be lower, the score impact of that review you wrote will go down as well. Which works the other way around as well. The people who reviewed you may lose score which in turn would decrease the impact on the reviews you received.
On another note, the implementation of EIP-7 has potential downside to your score as well. You can read more about how it might affect your score here: https://help.ethos.network/en/articles/11990244-eip-7-neutralize-spam-reviews