File this is the "woah" department. So many questions. Why so many tweets with a character length of 23 for unverified users? Why do verified users have such a large percentage of tweets with 135 characters?
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Also, the pattern marked in red shows up 4x, and some funkiness around in green.
135 smells suspicious
How are you doing character counts? Emojis are worth 2 characters each now, tho they used to be variable width unicode characters prior to late 2018
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I'm using Twitter's full_text index (start / stop). Basically just taking the stop position and subtracting the start position to get the number of characters. This gets around any esoteric counting issues with emojis / unicodes and just depends on Twitter's definition of a char.
Have you checked source client and or if the tweets promoted? Any advertising platforms, twitters own included, that makes encourage that behavior/not have been updated since the 140-280 change?