The same corner component, with identical scaling, on two corners of a stem, at the same y height, draws slightly differently. In the screenshot, which shows a stem in the Black master layer, the serif at left droops, while the right serif is correct. The serifs at the bottom of the stem are fine too.
In the next screenshot the same stem is shown, in the Regular Master. Here the left serif rises, the other serifs render correctly.
Finally, this screenshot shows the corner component in question