There are cases where you might increase weight on an exercise, and then see a lower strength score for that muscle group, which can understandably feel a bit confusing!

The reason for this generally has to do with how absolute strength is assessed when you make a weight progression. To help determine your absolute strength, we'll use an estimated 1 rep max for each of the applicable exercises that factor into your score, since this allows us to normalize performance across different rep ranges.

When you increase weight, you'll often initially decrease reps as a result. This is completely normal, and exactly how you should be approaching weight progressions. However, this came sometimes register as a lower 1 rep max after the initial increase. Here is an example:

200 lbs x 8 reps = 250 lb estimated 1 rep max
210 lbs x 6 reps = 247 lb estimated 1 rep max

After increasing by 10 lbs here, and dropping 2 reps as a result, the 1rm is actually slightly lower, which can ultimately carry through to a lower muscle group strength score initially after the increase. However, once you build up more reps at the new weight, it should soon surpass your previous score.

While the planned Strength Score volatility update should help with this, in general it's a good idea to look at the overall trend with your scores, since there will always be week to week noise that's pretty meaningless when you look at your progress over weeks or months (much like the stock market).

Finally, I should point out here that there can be other reasons for this one, such as another sub-muscle group exercise counterbalancing the progress you made on the exercise where you increased weight. For instance, if you increased weight on a quad-focused exercise, but decreased weight on a hamstring-focused exercise, this could register as a lower overall leg score. However, in most cases what I mentioned above is the likely explanation.