This problem does not occur to be personally, I am sure others have experienced it. When my friend goes to play on another server it spawns him as with a fresh spawn set up, this happened about 6 times today alone.
He has tried switching back over to the original server many times and other servers, it's most likely a bug.
Server hop a lot, see if you spawn as a fresh spawn and can no longer get your old state back.
Feedback appreciated.
This is a duplicate report and/or the developers are already aware of this bug/problem.
Please check the feedback tracker to see if an issue exists before creating a new one and instead vote the original one up so the developers can see it's a common problem. (Most of the most popular will be up top if ordered by Priority).
You can also use the 'Filter' textbox to search through existing reports using a keyword if it's not close to the top.
A list of important bug/issues that the developers are already aware of can also be found on the DayZ Forums:
http://forums.dayzgame.com/index.php?/topic/153994-early-access-important-information-known-issues/
Any additional images of the problem in question is always appreciated (if possible) and can be added by using the 'Upload File' section within a bug report.
I have added the original report above under ‘Relationships’
Cheers