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No, that reputation page is the measure of all things. If that page would be wrong, that would be a serious flaw. It's more likely that that one reputation point is some delete/undelete/migration magic which is is not tracked (but instead changes the history).
@Lix when i stared this question it got up/downvotes and in end it shows -1 votes because it have one more downvote then upvote but why today it got three more downvote after 8 days.
@jas - It was pushed to the front page from your recent edits. On meta, incoming posts are not as frequent as on the main site - so your post gets more attention here - hence the scrutiny...
Also, those very edits seemed to have been done just to get some attention. That might have caused some downvotes too? (Don't know for sure; I didn't vote but I somehow was tempted to, after seeing that edit...)
+1 for quick response but i have mentioned in question that "show delete post" not helping and i have checked it fully but their is no new deduction of reputation for -1 and the rep counter is showing that my rep is 311 before edit approvals but its 312 at that movement.