Time tracking regarding the end of the visit in the SM campaigns

Hello!

For quite some time now, we’ve been observing somewhat contradictory visitor behavior (according to Matomo data) during social media campaigns. In addition, the statistics show fairly high click-through rates and visit counts, but in each campaign, the average visit duration ranges from 0 to 9 seconds. This doesn’t make sense, since a visit involves transitioning from from SM platform to a landing page located on the website, and visitors understand this.

Could anyone share how the time of a visit is calculated, or what might be causing this discrepancy?

Many thanks in advance for help