Why numbers differ between screens

If Home says one visibility number and Topics another, both can be right. Each screen answers a slightly different question, over a different window or a different set of questions.

What each number covers

Where	What it covers	Window
Home	Answers to your topics’ buyer questions	The period you pick (7 days by default). The daily chart plots each day’s own answers.
Topics (Found)	One topic’s buyer questions	Rolling 7 days
Competitors	The same answers, per brand	The period you pick
MCP get_visibility	All tracked questions, brand-wide	Trailing 7 days, with 12 weeks of history
Looker Studio	One row per day, question and engine, summed or averaged however your chart groups them	The report’s date range

The usual reasons for a difference

1. Different windows. Home over 30 days and a topic over 7 days describe different stretches of time.
2. Different questions. A topic covers only its own questions. get_visibility counts every tracked question, not only topic questions.
3. Averaging. Home averages across questions, so a topic with few questions carries the same weight per question as a big one. An average of topic scores is not the same as the overall number.
4. Today is partial. Until today’s scan finishes, today’s point on a daily chart rests on fewer answers.
5. Grouping in Looker Studio. Adding Source Domain or Competitor Named to a chart repeats each answer once per domain or competitor. Keep those dimensions off headline totals.

Tip

To compare two screens, set them to the same period first. Most differences disappear.