This bug involves 2 ffcs. One has the "Is A Changer" flag checked. The normal ffc jumps onto the changer for no reason. It only happens under these obscure circumstances:

The x position of the changer FFC equals it's y position.
The x position of the normal FFC equals it's y position.
The x and y position of the normal FFC is greater than the position of the changer FFC.

Weird, isn't it? xD This happens in 2.50.1 and 2.50.2 and maybe even in earlier versions.

Test quest: http://www.mediafire.com/download/g5...gerBugTest.qst