Ahrefs backlinks

Hey there - I’m reporting on number of back links in a marketing dashboard for a client.

At end of March, this client had 142 more backlinks from sites with a domain rating of 30+ compared to today.

But … when I look at the “lost links” within the last 30 days, only 12 backlinks are showing up as lost.

Can you help me understand this?

Also, is there a way to see a moment in time snapshot of # of backlinks in the past?