You have custom processes and gel scripts that copy sub objects when an investment is copied.
After 16.1.1, you are now seeing duplicates.
Release : 16.1.1
There is a new Enhanced Copy functionality in 16.1.1
For SaaS customers, please contact Technical Support to have this feature disabled.
For On Premise customers, apply 16.1.1 Patch 1 and then run this query:
UPDATE CMN_FEATURES SET ENABLED = 0 WHERE CODE = 'DISABLE_COPY_FROM_TEMPLATE_SUBOBJECT_COPY_DE68998';