What happened?

I create a matrix field with a proper entry type.
I limited that Matrix field to have maximum 1 entry.
I added the matrix field (hero) to my homepage entry.
Entered the homepage and clicked to add a new Hero.
Started to edit but closed the hero editor. Clicked add hero again and a fresh Hero editor opened.
I finlized edititing and saved the hero. it showed up in the home.
but when I refreshed the other one that I started and closed also showed up.

Uploading Screen Recording 2024-09-02 at 2.29.39 PM.mov…

Craft CMS version

5.3.6

PHP version

8.3.3

Operating system and version

Linux 6.6.32-linuxkit

Database type and version

MariaDB 10.7.8

Image driver and version

Imagick 3.7.0 (ImageMagick 6.9.11-60)

Installed plugins and versions

CKEditor 4.2.0
Image Resizer 4.0.1