Keyword Not in top 100 dropped on Ahrefs

I was tracking keywords with Ahrefs and had a few phrases in the top 100. They weren't very close to the top 10, near the 50-100 range. I started building guest post backlinks to them (all random/begin anchors with no matching keywords) which were all high quality with 500+ words on domains that are typically DR30+. They weren't moving much but today I logged in and saw they were not in the top 100 and Ahrefs has:


for several of those keywords. I checked the URL for each of them and they were all still indexed. I can also find them searching for other, related terms. What exactly does that mean? I couldn't find anything on Ahrefs but obviously the URL isn't dropped. Does it simply mean it dropped out of the top 100?