You have to edit the Max_content_length of question2anwser software:
1. Through MySQL: execute this command:
ALTER TABLE `qa_posts` CHANGE COLUMN `content` `content` VARCHAR(32000) NULL DEFAULT NULL;
2. Edit the configuration file: qa-include/db/maxima.php
Find:
@define('QA_DB_MAX_CONTENT_LENGTH', 8000);
Change it to:
@define('QA_DB_MAX_CONTENT_LENGTH', 32000);
3. Save and update the config file. Enjoy