posts/pages being deindexed

hello, I have noticed that some of my PBNs posts/pages are deindexed. Let's say each of my PBN has 5 posts. Around 10%-20% of my network has several (1-3) posts deindexed. Even 2 months after they were published. When I add them manually to google submit url they instantly get into the index. However google doesn't want to naturally index them. What could be the reason for this?

Are they unique posts and well written content? Do they have links? Its normal sometimes, new posts delay indexing.

christenmorris said:

Are they unique posts and well written content? Do they have links? Its normal sometimes, new posts delay indexing.

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yes, unique and well written. some of them have links, others don't. It's pretty random. I noticed some of the articles get indexed naturally and after some time get deindexed. Then they never get reindexed naturally tho