I had suggested edits to many questions and answers and my edits were genuine: those posts had formatting or grammar mistakes but many of my suggested edits got rejected.

Since many posts had only one mistake (or more but less than 6 characters) and according to AU editing rules there should be edits at 6 places or more otherwise it doesn't allow to save the edits for a low rep user like me. Thus, I edit their question a little bit more (like replacing "ubuntu" with "Ubuntu" and apt-get with sudo apt-get) so as to make edited characters more than 6 but then my edits are being rejected. On the other hand some user with high rep doesn't have this limit (editing post at 6 or more places), thus their edits are directly visible.

So how to edit such posts for a low rep user like me and if I edit them correct way, why are they being rejected?