Moz Authority score dropped, pages indexed on Google disappearing

Hi! I had a couple questions regarding some issues I've discovered today. My Moz Authority score went up to 12 last week and dropped down to 10 today. It didn't show the down arrow with a 2 to represent the decrease in rank like it normally should, so I'm hoping it's just a hiccup that will resolve itself but I'd like to hear from someone unlike me who is knowledgeable on the subject.

Also, I noticed some pages that were performing pretty well suddenly disappeared from Googles indexing. When I do site:my domain.com it says that there are 80 results, but I see far less in SERP and count only 14.

I've been trying to work on backlinks so I'm worried I screwed something up and I'm being penalized, but when I look in GSC under manual actions I don't see anything.

Any insights and advice would be much appreciated. Thank you!