After upgrading to v17.4 RU1 of Service Catalog the list of my pending actions is empty for all.
This means
Service Catalog 17.4 RU1
Upgrading to RU2 resolved the problem
Found corresponding entry in the RU2 release notes under "Fixed Issues"
Installation information can be found here: Installing CA Service Management 17.4.2.0
CA Service Catalog End users are facing problem to see their pending request, assigned to their respective groups.