If your blocks won't break within a 16 block radius of your spawn it's no bug!  We do this in an effort to prevent trolling and protect you and your server. 

So if you're thinking you've gone crazy, don't admit yourself!  At least not unless you're allowed to take your MCPE server with you ; )  

Note: If this occurs outside of the 16 block zone feel free to get in touch with our support team by submitting a ticket.  And no, we will not forcibly admit you for disclosing this information : )