Cypress truncates the URL after login - cypress

Question

I have a simple login test in cypress (5.6.0, Windows 10). The application I am testing is written in PHP/MySQL. When I run the test in Cypress I get a 404 page not found error following the login.
This does not happen manually or with webdriver, just with Cypress.
Here is the script (which you can try)
describe('Admin Login', () => {
Cypress.config('baseUrl','https://www.edgewordstraining.co.uk/webdriver2')
it.only('Successful Login', () => {
cy.visit ('/')
cy.get('div#right-column > h1').contains('Web Testing Index Page V2 Sprint2')
cy.contains('Login').click()
cy.get('body').contains('User is not Logged in').should('exist')
cy.get('#username').clear()
cy.get('#username').type('edgewords')
cy.get('#password').clear()
cy.get('#password').type('edgewords123')
cy.contains('Submit').click()
//error 404 occurs here
//cy.visit ('/sdocs/add_record.php') //Had to add this as Cypress changes the URL from the form submit for some reason!
cy.get('body').contains('User is Logged in').should('exist')
//Logout
cy.contains('Log Out').click()
//Handle the confirmation Alert
cy.on('window:confirm',(str)=>{
expect(str).to.equal('Do You Really want to Exit the Secure site! Press ok to Continue ')
})
cy.get('body').contains('User was Logged in').should('exist')
});
And when I run with Chrome or Firefox, I get this in the log:
enter image description here
and in the Test Runner, the URL has been truncated:
enter image description here
The URL should be https://www.edgewordstraining.co.uk/webdriver2/sdocs/add_record.php,
but cypress changes it to https://www.edgewordstraining.co.uk/sdocs/add_record.php
webdriver2 is just a physical folder on the web server where this app/site is stored.
I see that someone else had a similar issue, but there are no replies on his question. Could anyone help? Thanks
Since the above post, I have now looked at the login function in the application itself.
else {
// document.write(response);
//location.replace("../sdocs/add_record.php");
//Had to change the line below as in Cypress, it is not moving back to the previous directory
//so have made it an absolute url instead
//window.location.href = "../sdocs/add_record.php";
window.location.href = "https://www.edgewordstraining.co.uk/webdriver2/sdocs/add_record.php";
return false;
}
The relative url path above should just go back to the parent directory (webdriver2) which it does if you use the site manually.
However, I have had to fix this as a fully qualified url to make it work in cypress.
So I have a workaround, but why does cypress handle it differently?