Help with DAX

Hello Community,

I need your help in writing the DAX formula for below scenario.

i am explaining my use case with the below sample data.

Now the requirement is to display the difference between noofbugs and bugsthreshold.
the formula for the same is  if((sum(noofbugs)-sum(bugsthreshold)<0,0,(sum(noofbugs)-sum(bugsthreshold))

the same formula is working when i have team name in my table visual as below.

Now the problem i am facing is below.

when i take only vendor as part of visual the DAX expression is not working as expected.

Below is the report that i can see.

But the expectation is below.

lets take Vendor1 for example, we have TeamA and TeamB under Vendor1.

TeamA - NoofBugs=5 and Threshold = 6 now the difference is -1, as per above formula final result is 0

Team B - NoofBugs=4 and Threshold = 2 now the difference is 2, as per above formual final result is 2

As per my expectation DAX expression should display 0+2 =2

But it is displaying 1, beacuse it is calculating all the bugs for all the teams under vendor1(5+4), threshold is(6+2)
now the difference is 9-8=1, but this is not correct functionally.

How can i write my DAX expression to fulfill my usecase?

Please let me know incase of any questions.

Thanks...