Service program signature not updated when re-deploying a web service

Hi all,
I hope you all are well!

I apologize for having sent this message twice,

I have been working on a web service based on a service program for a
while, which made me cope with a series of issues (arrays of
arrays-SOLVED!, CORS problems-SOLVED!) and now something awkward is
happening.

I changed the entry list of the second method to make room to a second
input parameter and consequently renamed the first one, then made changes
in the code accordingly, then ricompiled module and service program
successfully.

In the web administration page, I deleted the deployed service to reuse the
name before proceeding to deploy it again.

I have already done this a few times without problems when I needed to add
the second method or change the url.

Now, in step 4 of 9, after I set the service program's name to be used as
REST, the methods' signatures don't show the changes, meaning the second
method still shows the previous input parameter with the old name instead
of 2 input parameters with changed names.

None of what I tried has sorted any effect, as if these data are cached
somewhere.

Should I delete and re-create the whole thing (web server + http + web
service)? I hope no.

Do you have any hints?

Thank you