Mailbox App Problems

Hello,

I recently download the mailbox app and it has been nothing but trouble. When I tried the "Inbox Zero" function (just to see how it worked), it archived all of my emails. After seeing how it worked, I went onto my computer to put the newly archived emails back into my regular inbox. It seemed perfectly fine from my desktop, but there was one problem. When I went back to the Mailbox app on my phone, the archived emails were back in the inbox, but they were completely out of order. There would be some emails from 2 years ago at the top, and some from yesterday in the middle. I would like to have it sorted by date, but I've looked at all the settings and it doesn't seem possible. It seems like it's a problem with the phone, because my default Mail app has the order messed up too. Is there any way to get it back to how it was earlier?

Thanks