I hate it when I have to repost my post because someone else is posting another post at the same time. Is this considered as an error too? If so, please take the appropriate actions.
That's a setting in your profile, which you can disable yourself:
"Quick Links" (top right corner) > "Edit Profile" (from drop-down menu) > "Look and Layout Preferences" (left menu bar) > Check the box "Don't warn on new replies made while posting." > Save profile.
I've done it for you, but for anybody else who gets that "Warning 2 replies have been posted since you last viewed the thread" and wants rid of it, that's how you do it.