2.6.5 Bug

Does anyone have already encountered this? when you try to edit a published article then click update post, after it had updated the post, a text box appears in your article, thus, ruining your post.

i have a screenshot of that problem here > https://img.photobucket.com/albums/v101/iceblade_bladestone/blog/wordpresstext.jpg

is this a bug? or do i have a corrupted sort of installation? have anyone experienced this?

i think this happens when I try to post using the “paste from word” from the kitchen sink tool.

Anyone please help me solve this problem, Thanks in advance!!