See issue #406 and issue #281 for possible solutions. If none of them help, open an issue. Provide a screenshot along with your operating system and terminal application.

It depends on how the terminal assigns its colors. tview's default theme only uses ANSI palette colors. If your terminal defines a theme by changing this palette, tview will automatically adapt to it. Some terminals don't do this, however, and some do it for some themes but not for others. In those cases, it is not possible for tview to adapt its colors as it has no access to that information.

See also here and here for some discussion.