I think it is a problem related to missing data.... for the second row where Issue = 'Burned'... you will see that there is no data in the app for Aug 2020... because there is no data... available... it isn't able to return 0 as the Min... if you can create a row with 0 as value... it should work.
Best I have is the following Design Blog post on AGGR, might prompt some further thoughts for you. I will include the base link after that to this area in case you wish to search further in this area for other posts that may be helpful...
I see what Sunny was saying regarding the 0's having no underlying records, but I am not quite sure how to deal with that, hopefully the Design Blog area may provide you some better ideas.
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