Move autoshape next to table

[laralea]

I have a customer who has an autoshape in the margin to show changes in the
document. When he moves the autoshape (triangle) to the margin next to a
table, it disappears. He can draw a new triangle in the margin with no
problem, but can't move existing triangle.
Word 2003, Windows XP

 

[laralea]

I see that the object is anchored to the paragraph. How do I delete or unlock
the anchor?

 

[laralea]

I found the lock anchor setting