This is a known issue. I can't find the tracker issue for it now (on phone)
but the issue was identified for the intro and full images in com_content
On 29 Jun 2015 22:48, "nppsbh" notifications@github.com wrote:

Hi
I found a odd behavior in plugin using media field type.
Scenario where several media fields type exists.
If you select a image in one of those fields, but not the first in the
plugin everything is working as expected, when you hover the image name
nothing happens.
But if you also select an image in the first media field type in the
plugin when you hover the image name it displays a tooltip with the file
name, and that name will be always the name of the first media field type
image, even if you hoover other media fields type.

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#7285.

Found it #6799

Sorry if duplicate. Didn't look enough.

Not a problem - better to report and let one of us check than not to report
at all

On 30 June 2015 at 11:10, nppsbh notifications@github.com wrote:

Sorry if duplicate. Didn't look enough.

This comment was created with the J!Tracker Application
https://github.com/joomla/jissues at issues.joomla.org/joomla-cms/7285
http://issues.joomla.org/tracker/joomla-cms/7285.

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#7285 (comment).

Brian Teeman
Co-founder Joomla! and OpenSourceMatters Inc.
http://brian.teeman.net/