<p>When (certain low-rep) users are removed from the site, all their votes are reversed.  (This is a matter of ongoing debate, so please do not discuss it here: visit the <a href="https://meta.stackexchange.com/">main meta site</a>.)  The SE team also occasionally reverses votes it deems were applied in bad faith.</p>

<p>Your <a href="https://stats.stackexchange.com/users/27403/quantibex?tab=reputation">reputation summary</a>, available by linking through your user profile, shows that you lost two +2 votes from the removal of a user.  (I am not sure whether these specific entries are visible to just the mods, to you and the mods, or to all viewers.)</p>

<p>There is almost never anything to be learned about your site interaction when reputation changes in this manner.  The (rare) exception is when votes were reversed due to some gaming of the system, such as when rings of voters are detected.  (It is possible to be the unwitting target of such votes, so there are no negative implications for you.)</p>

<p>Many details of the voting system are usually not revealed, to protect the innocent and the guilty as well as to make it harder for people to misuse their votes.  Even the information available to moderators is limited.</p>
