Qq bubble is red. What happened?

This happens because a specific theme or skin is set.

You can try to change the theme or skin, or check whether there are other settings that cause the bubble color to turn red. The color of bubbles can also be customized through qq settings. Users can choose their favorite colors according to their preferences and personality, such as pink, purple, orange and so on. This custom function not only allows users to better personalize their qq, but also allows users to better identify different conversations.