Google Analytics defines a bounce as a single-page session on your site. Meaning that someone visited your site, and that there was only one event triggered and recorded by Google Analytics before the visitor left your site. Since it sounds like you are already implementing and using an event listener to track signup form subscribers; depending on the behavior of this third-party tool, it may cause a second event to be recorded via Google Analytics. Because there would now be two events being triggered within Google Analytics, this may cause your bounce rates to drip as there now isn’t a single event, but two events being recorded.
Just wanted to update with an additional data point:
These event actions started to be collected that same day.
I don't recall adding any form of tracking on that day for Klaviyo, was there a back-end change to how the form tracking implemented through GTM works?
Or, if that is a specific form of tracking that would cause that, what would it be so I can hunt it down?
Google Analytics defines a bounce as a single-page session on your site. Meaning that someone visited your site, and that there was only one event triggered and recorded by Google Analytics before the visitor left your site. Since it sounds like you are already implementing and using an event listener to track signup form subscribers; depending on the behavior of this third-party tool, it may cause a second event to be recorded via Google Analytics. Because there would now be two events being triggered within Google Analytics, this may cause your bounce rates to drip as there now isn’t a single event, but two events being recorded.