remove the "text-shadow"

#wpforo #wpforo-wrap .wpforo-profile-wrap .profile-stat-data-item {
font-size: 14px;
line-height: 18px;
padding: 1px 10px 1px 0;
display: block;
margin: 3px 0 2px 0;
text-shadow: 1px 0 #eeeeee;
}

and

#wpforo #wpforo-wrap .wpforo-profile-wrap .profile-display-name {
font-size: 20px;
text-shadow: 1px 0 #fefefe;
line-height: 24px;
font-weight: 200;
margin-top: 10px;
display: inline-block;
margin-bottom: 5px;
text-align: left;
padding-left: 40px;
padding-top: 50px;
}

or add to custom css

#wpforo #wpforo-wrap .wpforo-profile-wrap .profile-stat-data-item {
text-shadow: none !important;
}
#wpforo #wpforo-wrap .wpforo-profile-wrap .profile-display-name {
text-shadow: none !important;
}

Why this is happening? Any advice me for solution?