Oh, that's the hashtag... At primal it shows in Top, at Amethyst ( the client I use) I put it on the bottom.
Discussion
No, it's not just the hashtag. Look at the other screenshots and your 16:16 and 18:18 and sexy af posts... It's not a biggie I am just curious because my timeline on primal is showing these inconsistencies of note's font size.
Maybe it's a primal feature when you quote a post from another, it just comes out with a bigger font. It's what it looks like.
No, it's not that. There's a ton of reposts that have regular font. Your notes weren't repost either but original share. It potentially may be enlarging shorter note's text, up to a certain letter count. Though, still looks inconsistent in that.