what theme are you using?
what happens if you switch to the default theme Twenty Eleven?
(and add a test post with image)
what happens if you temporarily deactivate all plugins?
(and add a test post with image)
I’m using the Flex theme.
I tried to change the theme back to Twenty Eleven and switch the plugins off, but every time I insert the image the system add 2 more to the post.
the Flex theme seems to be a commercial theme;
in this case, have you contacted the seller of the theme for support?
can you post a link to your site to illustrate a post with the triple images?
I posted the issue at the Theme website too.
I’m testing the theme on virtual server so I have no public access URL.
I would like to know if somebody came across this issue before.
Does theme even control these core functions? i thought that this will be functionality that themes avoid and keep the standardized WordPress functions.