Wrong address for thumbnails in 'insert image'

Whenever I insert image from media library it correctly shows link (it opens inserted image in full size) but incorrectly uses relative links to thumbnail. The code is:

<a title="image_title" rel="image" href="https://example.org/info/site/files/2011/12/ICT_day.jpg">

<img src="../files/2011/12/ICT_day-150x150.jpg" alt="image_title" title="image_title" class="size-thumbnail wp-image-412 wp-caption alignleft" width="150" height="150">

<p class="wp-caption-text">image_title</p>

</a>

Is there any workaround to see thumbnails properly?
Firebug shows, that image which it tries to load (thumbnail) has addres:
https://example.org/info/site/2011/11/15/files/2011/12/ICT_day-150x150.jpg