There is a known issue that after updating to XenForo 2.2.x, the CSS changes in XenForo 2.2 now interfere with the section float behavior. In your vw_section.less template, add the following:
Code:
.bbWrapper h1.vw-head, .bbWrapper h2.vw-head, .bbWrapper h3.vw-head,
.bbWrapper h4.vw-head, .bbWrapper h5.vw-head, .bbWrapper h6.vw-head {
clear:initial;
}
You should revert this change after your next VaultWiki upgrade.