Mod_security can prevent edits and you will get the error code that is configured within mod_security(while posting data).
Here is a useful way to have mod_security ignore your home / office IP and yet stay active for all other IP addresses:
SecRule REMOTE_ADDR “^127\.0\.0\.1$” phase:1,nolog,allow,ctl:ruleEngine=Off
Simply change the 127.0.0.1 to your home / office IP. If you have more than one IP to add, then simply copy the line and modify it to a second or third IP.