How do I delete the Edit Delete buttons suddenly showing above pictures?
you need to increase the memory limit size in php.ini

That indicates that Drupal needed more memory than PHP was allowed to give it.

Drupal 7


Memory increase to 128M:
(This has worked every-time; and used to always work for D6 as well)

Create a new file php.ini, and add the code...
php_value memory_limit = "128M"
and put that file in your Drupal 7 (or D6) root folder.
    For step-by-step details, see comment below...
    Drupal 7 "Fatal error: Allowed memory size of ...".
If you need more than 128M:

Add the line
ini_set('memory_limit', '512M');
to your [Drupal 7 root]/sites/default/settings.php file.

I have yet to need this much memory, but I did achieve
a memory increase to 512M using this slightly more complicated
process that involved temporarily changing the permission level
for that file.
    For step-by-step details see the comment below Drupal 7 memory increase to more than 128M.



refer this link 

https://www.drupal.org/node/76156