When looking at an asset's Resource Manager page, on the left column in Resource Associations, all expected associations do not appear.
There is no issue, the display is working as designed.
The Resource Manager's Resource Associations section may be confusing in how it displays is associations. In general, there are no known issues that would cause it to not show all expected associations. The following describes how this section works.
Resource Manager shows User's Manager and/or User's Direct Reports incorrectly