i've looked around for awhile and haven't been able to find anyone else reporting this very specific bug
Here's a few:
http://www.gamesas.com/index.php?/topic/1260165-physics-is-affected-by-framerate/
http://www.gamesas.com/index.php?/topic/1259677-physics-issue-other-bugs/
http://www.gamesas.com/index.php?/topic/1263595-books-wines-apples-are-thrown-from-nowhere-on-me-wtf/
http://www.gamesas.com/index.php?/topic/1260072-items-flying-around/
Also related:
http://www.gamesas.com/index.php?/topic/1265407-dragon-bones-keep-moving-around/
http://www.gamesas.com/index.php?/topic/1264856-dragon-skeletons-flopping-around/
http://www.gamesas.com/index.php?/topic/1263173-dragon-skeleton-drops-out-of-the-sky/
have you disabled vsync?, disabling vsync causes this it seems as after re enabling it this problem has vanished again for me

That probably worked for you because enabling vsync will also drop your FPS. This bug is drastically affected by frame rate, and becomes far more pronounced the higher your FPS.