Inserted Macros and Images in a page seem to randomly jump within a page when editing

When editing a Confluence page which contains a combination of text, images, and macros (unknown if this is important to the bug) clicking on the placeholder in the WSYIWYG editor which represents the macro or image causes the item you are clicking on to (seemlingly) randomly jump about on the page.

I have uploaded to dropbox (as it's bigger than 10 megs) a demo video which one of my users created to reproduce the problem (his voice, not mine), which clearly shows the problem. I have been able to intermittently reproduce this problem on my machine as well.

Something as simple as

test
test
test
<image>
test
test
test

in a new page will allow this behaviour to be reproduced.