Multi-table measure works by itself, but doesn't slice properly

[OfficeSpacePir8]

I pull Jira data for a development team to measure team productivity. I have several tables for that, as well as a designated Calendar(Date) table for date relationships across tables. On one of the pages in my report, I have a histogram displaying the average number of tickets completed per developer per month using the following measure:

Integrated Per Dev = 
var maxdate = CALCULATE(
    MAX('JIRA-Issues'[Integrated Date]),
    USERELATIONSHIP('Calendar'[Date], 'JIRA-Issues'[Integrated Date]),
    'JIRA-Issues'[Integrated Date]
)
var devCount = CALCULATE(
    COUNTA('JIRA-Developers'[Developer]),
    'JIRA-Developers'[Start Date] < maxdate,
    'JIRA-Developers'[End Date] >= maxdate
)
return
CALCULATE(
    SUM('JIRA-Issues'[Is Integrated]) / devCount,
    USERELATIONSHIP('Calendar'[Date], 'JIRA-Issues'[Integrated Date])
)

 This works as expected using a relative date slicer for Calendar[Date] to filter the visual. On the other hand, if I add a dropdown slicer for a field like 'JIRA-Issues'[Team] which groups the tickets by a subset of developers, then the visual displays values based on the total number of tickets in that month rather than the filtered total.
* E.g. The value for March unfiltered equals 3.9 and there are two "Teams"; filtering by one team equals 2.0 and the other eqauls 1.9

Since these add up to the total (as do all other months) it appears that "SUM('JIRA-Issues'[Is Integrated])" is returning the total number of tickets rather than the number of tickets integrated by the target Team. It appears that my filter context is not what I'm expecting, so I just need to know what mistake I'm making.

[OfficeSpacePir8]

@V-lianl-msft Sorry I read your reply and saw that I couldn't upload files directly, so this got buried in my to-dos. I've uploaded an .xlsx and a sample .pbix using the data here. The visuals I added should quickly show the issue I'm seeing.
WeTransfer Sample Data 

[V-lianl-msft]

As you said, the result of measure is affected by the current context. It is difficult to analyze the issue only by description. Can you share a sample pbix after deleting sensitive data?

https://community.powerbi.com/t5/Desktop/How-to-Get-Your-Question-Answered-Quickly/m-p/1447523