Not sure how you have made your post, but I'll use the example of my latest post on Facebook.
When I check my Facebook page and go to the insights tab, it shows me the following stats:
-My post had a reach of 1.2k people
-My post had an engagement of 6 clicks and 22 reactions (comments, shares, likes)
(pretty sad really when I sum up the stats like this lol. Luckily I'm enjoying myself doing it)
This is from a post where I typed in some plain text, and added a youtube link. The video is embedded. So of the 1.2k people reached, I'll have gained 6 views from this.
In case you're sure you have 90 clicks on the youtube link and people viewed the video then they should add up to your count in youtube. If not, I've not got a clue, sorry. Unless some of these clicks are from the same location, for example from you testing. Correct me if I'm wrong, but if I'm not mistaken, a lot of views of the same ip/location won't add up.