Hi @Jakki ,
Based on your sample picture, I could only guess there is a relationship between [UserCode] field in Users table and [CreatedByUserId] filed in Leads table. If I got it correctly, that could be the problem.
Please check the crossfilter direction of this relationship is both instead of single.
If the direction is single, you could get all the same value for each user, when you change it to both, the value should be correct.
single directionboth direction
About crossfilter direction, you can refer this document: Cross filter direction
If this post helps then please consider Accept it as the solution to help the other members find it more quickly.