Cucumber tags are case-sensitive. Be careful when using tags that are the same but have different cases, you might not get the results you expect if you use tags to select scenarios.

Bad

Feature: logging in

  @Smoke
  Scenario: logging in
    Given I have visited the website
    When I log in with "<username>" and "<password>"
    Then I will see my account

  @smoke
  Scenario: logging out
    Given I have visited the website
    When I log out
    Then I will see the login page

Good

Feature: logging in
  @smoke
  Scenario: logging in
    Given I have visited the website
    When I log in with "<username>" and "<password>"
    Then I will see my account

  @smoke
  Scenario: logging out
    Given I have visited the website
    When I log out
    Then I will see the login page