Blue ring on furni

[asic]

Hi. I am having a trouble with my swfs I believe, a problem I've never ran into before. When a furni height is equal to or above 0.9, a blu ring appears when you hold your mouse cursor over that furni. That makes it impossible to sit on chairs that it behind tables for example, because your character walks to the blue ring instead.

Have anyone of you seen this before? Do you know how to fix it?

Here's a pic: http://i.imgur.com/f1AoInK.png

[MentaL]