When a visitor comes to a page, only one s.t() server call should be sent to Adobe Analytics collection servers. Duplicated server calls will result in inflated page views metric that may affect many reports and derived metrics. For example, analysing the customer journey in the Page Flow report or Flow visualisation in Workspace, you may notice that many visitors after viewing a certain page viewed it the second time (while they actually viewed the page only once).
Do the Adobe Analytics testing carefully. This issue especially often may be present on the sites built as a single page application (SPA). One call may happen on page load and the second one on direct call rule if Adobe Analytics is implemented via Adobe DTM (dynamic tag management).