So when I first started this blog, doing like long stints of Homestuck, I noticed that after a certain amount of posts I would no longer be able to post anything afterwards.
I googled it, and found out that Tumblr has a limits of posts that you can make, For Text-Posts, you can only do 250 per day, and this is split up between ALL of your blogs, not 250 per blog.
So I have to watch out and be careful where I am at post wise, though sometimes I get a bit too ahead of myself and have to wait til the next day before resetting.
Reblogging shit also counts as a post, so it is really Tumblr’s fault. Though I never knew about the limit until I started this blog either.