Difference between popularity and kudos.sum(weight) API v2 sort

ttadej

Sort query results by popularity (kudos only). Most number of the kudos to post increase its popularity.
Posts not having kudos shows the Negative values in popularity. A negative value for the popularity decreases on the number of page views to the post.

ttadej  Sort by popularity and sort by kudo weight will never give you the same results. It does not mean that the post having the higher number of kudos will have the higher popularity. Seems popularity depends on some other factors also. 

ttadej - Popularity does work with the time period.  e.g 

Message A has 20 kudos in 1 week 

Message B has 15 kudos in 2 days. 

Message B will always have more popularity than message A.  There could be multiple criteria for this(example) which lithium support can answer. 

ttadej  That seems your instance-specific issue.  It works fine in our instance.  Definitely, you should reach out to support.