Investigating (and fixing) Problem with Indeed Job API Feed being alerted by Google Webmaster Tools

Hello, i've got a german Wordpress Job Board: [login to view URL] The Jobs displayed there are a combination of some posted jobs with job detail description etc. and most of the other jobs are an import feed from [login to view URL] API (the simply link to the indeed job description for that job). The Problem: Google Webmaster Tools doesn't index my site because it says there are many sites not indexed (see errors on screenshots). I also have a sitemap plugin for wordpress. The sitemap includes the "real" jobs on my site and also the indeed-links. Maybe this is a Problem. But i don't know why, because i own another Job Board ([login to view URL]) which is a almost exact clone of this one. On [login to view URL] there is no problem in google webmaster tools shown. I need help to investigate where the problem is and how to solve it, so google doesn't show errors and my site can get indexed. Thank you so much for your help. If there are things unclear, please let me clarify :) Kind Regards, Philipp