Help Needed: Maps -> Zones -> Trigger upon entry (GPS Accuracy?)

Configuration
,
1

I have a passive zone setup as seen below:

image
image1107×656 47.3 KB

This screenshot is the output from my map card:

type: map
entities:
  - entity: person.me
  - entity: zone.grocery
...

As you can see from the datapoints I never entered the zone. But I have an automation that triggers upon entry of that zone that did trigger.

trigger:
  - platform: zone
    entity_id: device_tracker.myphone
    zone: zone.grocery
    event: enter
condition: []
action:
  - service: notify.mobile_app_myphone
    data:
      title: Grocery List
      message: "{{state_attr('calendar.alexa_shopping_list','all_tasks') | join(',\n')}}"

Why did this trigger? (My guess is that my GPS data reported an accuracy >100, which could possibly put me inside the zone?) More importantly, how do I avoid this from triggering in the future?