Dear Tumblr for Android,
This is my primary blog for a reason. Stop randomly changing where to make posts by default!
If it’s anything like the iPhone app, it will post to whatever the last blog you posted to was as the default. Primary or not doesn’t matter.
Also, it will post automatically to the last of your blogs you looked at.
So if you check how many followers you have on a sub blog or answer a question directed there, the app will think you want that to be your default.
Well that’s stupid. >:v