I have just noticed that the second character of 会社, which displays fine for me in the edit window, now shows up as a different and unfamiliar character when I save the post. It displays as the right-hand character of the two below, which I understand is an older non-simplified variant.
View attachment 11597
Do you see the same?
Also, could you confirm whether you see the ~ character incorrectly superscripted?
(I plan to report these as glitches; I just wondered if you saw the same on what is presumably a Japanese-version OS.)