Any time that I have hit a "major benchmark" for solving X number of puzzles, it will show the points being added to the bar. But as soon as I tap 'next' to move to the next puzzle, it resets my point total to before the benchmark was tallied, and it also appears to remove any points awarded for speed or my streak bonus as well.
I've only ever seen that on the first puzzle of a session. In those cases, what happens is it gives you the same puzzle as your previous session and gives all the bonuses but should not have given those. So when the next puzzle loads, the original points are shown.
Any time that I have hit a "major benchmark" for solving X number of puzzles, it will show the points being added to the bar. But as soon as I tap 'next' to move to the next puzzle, it resets my point total to before the benchmark was tallied, and it also appears to remove any points awarded for speed or my streak bonus as well.