There could be a Vista Rule in place that modifies data, but given the
value this seems unlikely.Maybe there is an old library implemented in
some forgotten testing environment? I would recommend to create a
Hit-based Segment for events with the eVar value in question, then use
available dimensions in Workspace (Page Name, etc.) or even Data
Warehouse (to get the Page URL, Visitor ID, IP address, etc.) to analyze
where they come from.