Page Design changes when set as Homepage

Hello Support Team,
I have a problem with a Page I created with GeneratePress. The website was developed by another company and now I had to build everything new, because of many changes. For that, I changed the theme to GeneratePress and worked out all de Pages. Everything works fine, except for one thing. When I set a published Page to the Homepage in WordPress, the side changes. For example, I made red Icons and they turn black after I set it as Homepage. When I view the Published Page without defining it as a Homepage it looks totally fine.
Thanks for helping me.