Fingerprint behavior different to Firefox

Hi, I'm using Librewolf on Windows and I noticed that somehow the fingerprint ID on the site https://fingerprint.com/demo does not change after closing and opening again. I have clean installed Librewolf and kept default settings.

Usually I do not pay too much attention to these test sites. However, when I tested with Firefox clean profile and the settings:

• uBlock Origin installed
• Strict ETP
• resistfingerprint on
• Delete cookies and site data when Firefox is closed on
• Remember browsing and download history and Clear history when Firefox closes on (so it could be the same as Librewolf's default settings)

the ID does change after closing and opening Firefox.

I'm not totally sure if it's reproducible for others or not. This is my recording video:

https://pixeldrain.com/u/TpvthmAq

If I'm not mistaken, the only factors that affect the result on that site are resistfingerprint, cookies and history, in which those configurations on both browsers are the same on my machine. That's why I thought they should behave the same. I just wonder what makes the difference in behavior between 2 of them?