Like only once the post, throughout all Machines

I installed the plugin WP-Ulike, but I find that I can like only once.
I checked out that link from different machines,… always finding I have the option for Un-Like only.

And on it as I did not register I an unable to un-like also

What I find is… on Post page…
Logging Method :: “Logged by user-name”

https://lockyourstay.com/blog/index.php/the-home-should-be-the-treasure-chest-of-living/

can you please help me out?

https://www.ads-software.com/plugins/wp-ulike/