Doesn't count correctly

[koutarou ishibashi]

There are 11 stories under one Epic
Epic has a field "counter"

In JIRA automation, when the status of the story triggers a change, the parent epic's counter is +1
{{#=}} {{issue.customfield_xxxxx|0}} + 1{{/}}

If you change the status of 11 stories at once,
The Epic counter should be 11, but it could be 6 or 7.　Why?　Isn't JIRA exclusively controlled?

[John Funk]

Hi Koutarou,

How are you changing all 11 at once? 

Also, can you share the rule and the audit log that fires when you change all 11 at once? 

[Bill Sheboy]

Hi @koutarou ishibashi 

Yes, and...to John's suggestions:

When summing / counting issues in a parent for child issues, I recommend completely recalculating the value spanning the child issues rather than just doing an increment / decrement.  That will ensure there are fewer errors due to timing / rule engine problems in rule processing.

Also, please describe how you are changing the status of 11 stories at once: manually, bulk update, with the REST API functions, with an automation rule, etc.  Knowing that may help explain this symptom.

Kind regards,
Bill