Here are a couple threads that might help explain what’s happening. You are attempting to sort a timestamp, but that’s not how glide sees. Even though it’s mostly numbers, it’s till just text to glide. Sorts happen left to right, so no matter what, 1 comes before 2. Doesn’t matter if it’s a month, day, or year. It’s just sorting by individual character by character. The reverse order may be working for now, but remember that we just went from September (9) to October (10). Glide is comparing the 1 and the 9 first.
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