Duplicated documentary series?

Whoever declined this didn't certainly make any effort to explain to me what I did wrong and how I can make this work :-(

https://contribute.imdb.com/contribution/260411-091715-638000/

 Declined (1)

@ExTechOp​ - After further reviewing, these have been merged and the changes are still in-progress. They will be live on the site once completed.

To answer your question, this was rejected because as stated on our guide linked above:

3. Unfortunately two series pages cannot be merged if episodes exist on both titles. If you wish to merge two series pages please submit a title merge on any associated episodes first, then, once these have been approved, please submit a merge on the parent series titles.