I updated to the latest version being on beta channel and some comments in threads look like having 125% size of letters compared to others. Idk if that's some option in settings (I've not found one) and I don't see some systematic rule of why it happens.
edit: added screenshot, first comment is of different size to the next one, changing font size settings keeps the difference
If Connect is the only app you noticed this then it may not be the launcher. I've sometimes seen font size issues after adjusting the text option setting but that gets resolved after reopening Connect.
Does the issue occur every time or just sometimes? Also, are there other posts with this problem?
It seems to happen only in Connect, in every post without any common cause I can point on.
Perhaps some combination of settings is behind this. What are your text option, post, and comment text sizes? It looks like 0.875, small, and small, but just to confirm. Also, you've tried forcing closing Connect and reopening?