This is a theme conflict. Use this CSS code to fix red titles. I have no clue for blue titles. It would be better if you ask support question to this theme developers:

.wpforo-widget-wrap .block-title span{
font-size: 20px!important;
background-color: #cd4a41!important;
padding: 6px 12px 5px!important;
color: #fff!important;
display: inline-block!important;
line-height: 17px!important;
}
.wpforo-widget-wrap .block-title {
margin-bottom: 13px!important;
border-bottom: 2px solid #cd4a41!important;
margin-top: 25px !important;
}

Hi Robert,

Thank's a lot!

I ask to the theme developper allready (tagdiv newspaper), to make there theme compatible with the best wordpress forum, but they still make it compatible with the old BBpress forum only.