Why is this an issue?

Properties and Get method should have names that makes them clearly distinguishable.

This rule raises an issue when the name of a public or protected member starts with 'Get' and otherwise matches the name of a public or protected property.

Noncompliant code example

using System;

namespace MyLibrary
{
    public class Foo
    {
        public DateTime Date
        {
            get { return DateTime.Today; }
        }

        public string GetDate() // Noncompliant
        {
            return this.Date.ToString();
        }
    }
}

Compliant solution

using System;

namespace MyLibrary
{
    public class Foo
    {
        public DateTime Date
        {
            get { return DateTime.Today; }
        }

        public string GetDateAsString()
        {
            return this.Date.ToString();
        }
    }
}