Why does my trigger get invoked more than once for the same event?

The most common reason for a trigger to get invoked multiple times is that its match criteria apply to multiple, similar events. For example, if a trigger is configured to run when an interaction’s Archive attribute is set to true, it will get invoked when the attribute is first set to true and again whenever any other attributes on the interaction change, as long as Archive remains true.

For more information, see Overview of triggers.