This might be off-topic but I just want to understand why maybe i'm doing something wrong.

Whenever I quote a person's post in a reply, it gets deleted and there are no rules that states this section's guidelines.
Despite the fact that there is no rule against quoting another member post in the forum, but if your own reply appears to be off topic the the mod will do justice to your reply by way of deleting it. And also know that not all rules are written so try and improve your posting quality and you will see that your reply will not get deleted in future.