I have had my correct highest correspondemce rating noted on my profile as 1833 for many months. I recently achieved a higher rating of 1844 but this has since never been recorded as my highest rating.
which game did you actually reach 1844? I couldn't find it. But I did see it showed 1844 on your profile graph. My suspicion is that the rating graph is wrong here, and the best is correct. Otherwise send a game whre you started at a rating N, and got a bonus B for winning, and N+b=1844. I couldn't find a game like that for you, so I think 1844 is higher than your highest peak rating.