Hello, @shinestar,
Again it is the responsiveness issue, your MAC screen size is very high resolution and by default bootstrap has set the classes and code till 1920px of the screen resolution, so in order to solve your issue you need the Custom CSS code, Please copy and paste the below given CSS code to Porto >> Theme Options >> Skin >> Custom CSS and check back to your site after clearing the browser cache.
@media (min-width: 1921px) and (max-width: 4000px){
.home .feature-container .vc_slide .vc_carousel-inner .vc_item .vc_inner img {
width: 100% !important;
}
}
We hope this will resolve your issue.
Best Regards,
PThemes Team.