Tactics difficulty level been modified??

Hi all I'm just wondering if anyone else has experienced an issue similar to what I have noticed this past 2 weeks or so. 

I have noticed a huge huge increase in the difficulty of the supposedly lower rated tactical problems. At first I assumed they were higher rated problems as I use my mobile mostly and the ratings don't show up. Also I was getting maybe 1 or 2 moves correct and the final one wrong so my points deduction was minimal. 

Then I started getting deducted 17, 14, 23 points etc and I went back over the puzzles and still felt they were far too difficult to have that many points deducted from my rating. 

I work hard on tactics, I read a lot of books on them and I consistently try to improve my rating. My rating helps me to track my progress and is a constant reminder that my study is not going to waste and that I'm improving everyday.

Perhaps I'm overreacting but it seems I have lost a major amount of points in a short amount of time and when I seen the rating of some of the problems that I failed I was very surprised that they were rated so low (some below 1000) when they were clearly so difficult.

Obviously I am a low rated player myself trying to improve and I am not an authority on the matter of assigning ratings to tactical problems but it is frustrating that it is a recent thing only after a long time of steady progress with a huge deduction in the past days.

Has anyone else experienced this recently? I would love to hear your opinions? 

B

They may have loaded in a batch of new puzzles. In that case, there are likely a bunch that will take a while to get their rating to a more appropriate level.

Thanks for the reply, Hopefully that is the reason for it because the only other reason is I have suddenly become far worse at tactics :-(