Fawn Smythe

The last couple of weeks I have noticed this small box appearing an disappearing near the knee of my avatar. We at first thought it had to do with an attachment that was part of my outfit, but when I had no attachments on it still appears. Any idea what this lil box could be?

In the last couple of weeks I have noticed this floating box around the knee of my avatar. The first time it was noticed I had an attachment on my hip, thinking it had something to do with that I detached that attachment. That did not correct the issue and it still appears for a couple seconds then poof its gone. Anyone have any idea what it may be?