It might just be because of the way the manga artist is drawing arms (and hands), as I've noticed that in quite some panels already. Anatomically speaking, proportions are a bit off, but close enough so it gives an uncanny feeling. This is especially true with Haruyo, as she is quite tall, it exaggerates the issue. It gives off a bit of a mantis feeling, with arms too long for her body. But I think it's just due to proportion mistake, and there are no intention behind it.
The artist grew up reading shoujo magazines and for the longest one tried to be a shoujo mangaka, so I guess that's why they have a habit of drawing long arms and large hands. The artist is aware of this too.

I understand there are codes, but sometimes, it's really unsettling. I never got that feeling from any shoujo manga I've read, unless there were issue with anatomy. To be fair, different proportions doesn't necessarily mean being anatomically incorrect. Having longer arms and hands is not so much the issue actually. It's the join placement. It's just wrong sometimes.
For example, the hands in the bottom left panel, look almost disarticulated. Or look at the arms on the top panels, very long for sure. But the joint placement is a bit off (especially on the right panel, the wrist joint is really weird).
https://dynasty-scans.com/chapters/dear_flowers_that_bloom_in_days_of_yore_ch13#5
I honestly don't care much, I just happens to work an artistic job, so I tend to notice that kind of stuff (but don't mind it). Lots of manga artist are not super good with anatomy so mistakes happen all the time. In this case, this is just to explain the unsettling/uncanny feeling that some panels can convey, unintentionally (compare to other panels were it's total intentional).