Just had a similar thing happen to me on top of one of the big new buildings in the cherno outskirt. I tried going down from the top bit, suddenly my character walked forward, fell down, lost some health from the fall and then suddenly teleported back up to grab the top part of the ladder again. Afterwards I could climb down normally.

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've added the original as a relationship which you can use to post any additional information in the one place.

Cheers