Tactic Trainer broken?

It's not broken but there has been a change in how they're rated on the backend. That change doesn't show in the interface yet, so the ratings shown can be a lot different than the actual puzzle's rating.

That change doesn't show in the interface yet, so the ratings shown can be a lot different than the actual puzzle's rating.
But which of the two ratings is used to select the puzzles presented to the user and to update the user's rating? Because I feel that some very hard puzzles shouldn't be given to me at all, considering my rating.

That change doesn't show in the interface yet, so the ratings shown can be a lot different than the actual puzzle's rating.
But which of the two ratings is used to select the puzzles presented to the user and to update the user's rating? Because I feel that some very hard puzzles shouldn't be given to me at all, considering my rating.
The backend rating is being used for both puzzle selection and rating.