Thank you for buying Matchpress! We hope it will meet all your expectations.
We remind you that a theme affects the presentation and visual style of your site, while plugins add all kinds of features and functionalities. MatchPress should be compatible with all themes, which means that its functionality should work well with any theme you might be using.
However, as mentioned, “a theme affects the presentation and visual style”. Please find the attached screenshots. You’ll see that the theme has a part to play in the look of the member swipe. It seems that the theme you are using applies a red background color on the button. You should report this to your theme authors, so they can make the plugin compatible with the general look of their theme.