Datadog - Metric type Medadata on Metrics Summary

[daletake]

I have 2 metrics tracked with DogStatsD's increment function.
Both of them were setted as metric type "rate" on in-app (Metrics Summary).

On Dashboard 1), I'm showing a widget "Query Value"´s visualization: a = sum:mpcsgc.mpcsgc.hits{*}.as_count() and "take the average"

On Dashboard 2), I show 3 widgets:

1. showing "a", the same as above
2. showing a "Query Value"´s visualization: b = sum:mpcsgc.mpcsgc.total{*}.as_count() and "take the average"
3. the arithmetic: a/b

And I got the values:
Dash 1: a=1.10
Dash 2: a=82518 b=81913 a/b=1.01

Now, I changed the metric a (mpcsgc.hits) as "count" on in-app (Metrics Summary), and refreshed my browser, but I got:
Dash 1: a=0.11
Dash 2: a=8266 b=81913 a/b=0.1

Why 4 values so different for metric "a" ?