Hi Rhema,

It's default style (Designer concept, don't ask me why), but can be changed.

For example, start with:

.sp-megamenu-wrapper .sp-dropdown.sp-dropdown-main.sp-menu-right::after,
.sp-megamenu-wrapper .sp-dropdown.sp-dropdown-main.sp-menu-right::before 
{width: auto; height: auto; }