Average Changes when Zoomed

We have some data which displays a low hourly average when viewed across say 30 days but when you zoom in to a few days the average jumps up which is wrong: I can't show a 20s average and then, when I zoom in show a 75s average...
The data points exist for every 5min.

Zoomed Out (Oct 7-22) - timestamp buckets are per hour:


Zoomed In (Oct 13-22) - timestamp buckets are per 3 hours:


Am I just bad at stats or is this a bug?

Also, I've set it to show hourly but it wants to show 3h - how can I change this? The UI suggests we can have custom values:

Select an option or create a custom value. Examples: 30s, 20m, 24h, 2d, 1w, 1M

You are running into this issue: https://github.com/elastic/kibana/issues/42611

As linked in that issue, there is a behavior change that you will see in the future 7.5 release: https://github.com/elastic/kibana/pull/47599

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