Happy to help @ivanlgarcia28 .
Based on your current setup you are storing the webdriver instance in a static variable which means it will be shared with all the tests that access it. If you're running into issues with this setup only when your tests run in parallel then it may help to have an instance of the IWebDriver class per test. Perhaps something like below would help ensure each test works on a different instance of Selenium so that operations from one test don't interfere with another running at the same time.

I'd recommend also updating to the latest versions of Selenium.WebDriver if you can to ensure you're using any of the latest bugfixes. Your sample uses 4.14 but the latest is 4.18. If you continue to hit issues then it might also be worth reaching out to the Selenium team at https://github.com/SeleniumHQ/selenium for advice as they may have a better sense of what patterns may work to run Selenium in parallel

[TestFixture]
[FixtureLifeCycle(LifeCycle.InstancePerTestCase)]
[Parallelizable]
public abstract class TestBase
{
    private readonly IWebDriver Browser { get; set; }

    [SetUp]
    public void SetUp()
    {
        ChromeOptions chromeOptions = new ChromeOptions();
        chromeOptions.AddArguments(new List<string>()
        {
            "--headless",
            "--incognito"
        });
        Browser = new ChromeDriver(chromeOptions);

        Browser.Manage().Window.Maximize();
    }
    [TearDown]
    public void TearDown()
    {
        Browser.Quit();
        Browser.Dispose();
    }
}