indexing web 2.0

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I have noticed a lot of my tumblrs have disappeared from my search console and noticed many arent indexed anymore? Do you think it comes from the fact the freelancer that created them for me didn't use a proxy? Google deindexed? Or is possible its tumblr itself? What can I do to reindex them?

Hey guys this is my first post here, if anyone can help that'll be awesome! basically there is a web 2.0 in my niche that ranks really high for every keyword, but for some reason when my competition posts there their posts get indexed and mine don't....this is really frustrating, I tried...