We've picked apart the "bug" and discovered that users only have the 11 reputation as an initial default value until their first up-vote or flag (i.e. first operation where reputation matters). This is fine, for now, because the reputation is (re-)calculated before the operation -- but is confusing and may cause problems anywhere that reputation is not recalculated before use.
Ok, i've not posted anything yet just commented. What will happen if someone flag me?
Depends on who flags you or up-votes you. If someone with high rep(7-9) flags you, you're gonna be stuck at -5 or something and vice versa for up-votes. More the reputation more influence your votes have!
Read this: https://steemit.com/steemit/@dantheman/brief-update-on-reputation-score
Thanks