Attribute options are not deleting in magento

It may happen due to lesser php value of max_input_variable.

To fix this problem open .htaccess file of magento's document root and write this in it:

php_value max_input_vars 2500

You can also do the same by adding/changing max_input_vars value from active php.ini of your server.

example:

max_input_vars = 2500