did you have the debug console on at the time? If not please have it on from now on just in case it happens again. Without a log it is almost impossible to know what happened 
This is one strange bug, I am thinking that something in your world has gotten corrupt and is defaulting the spawn back to that point
You could try sending the world via email to red51 to check out 
email: support@jiw-games.net
As @Minotorious said, the world would be helpful, at least the main .db file
As @Minotorious said, the world would be helpful, at least the main .db file
Greetings. I sent the whole world to your email.
Hi Walter, unfortunately we didn't receive your mail yet. Did you send it to support@jiw-games.net? Was the size of the attachment maybe too big? Maybe send me the world via PM here in the forums, or alternatively upload if on somewhere (e.g. google drive, dropbox etc) and send me a link
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