Dashboard post titles are not properly shown

When I activate SEO press, dashboard post title is not properly shown.

The default post “Hello world!” is shown as:

H
e
l
l
o
w
o
r
l
d
!
from width 690px to 1084px on dashboard post.

From 1085px and further,
He
ll
ow

then
at 1700px around
Hello
world!

For bigger size screen, less than ten letters can be shown as post title at the maximum.

For narrower width without dashboard’s left menu, it seems okay.

–( My circumstances )————————

I made a new wordpress site from scratch.
Theme is Twenty Twenty-One.
Only plug-in is SEO press.

I have tried major browsers on a few devices but the problem stays the same.

Please follow the default appearance of wordpress.

Thank you.