1 . try adding this custom css in wp-admin -> appearance -> customize -> custom css :
.pusher .container {
display: flex;
}
2 . that is coming from jetpack related posts feature .
3 . seems like there is some connection being fond by jetpack there . Would suggest delete this register page and create a new one and select it in wp-admin -> settings -> buddypress-> options .
4 . try adding this custom css in your wp-admin -> appearance -> customize -> custom css :
ul.products.columns-3 {
display: flex;
flex-wrap: wrap;
}