Expense Report Graph

Hello it is me again. Is there anyone familiar with Saved Search Graphs? What we want is to show bar graph per month on the X axis and Amount on the Y axis. The goal is to see it per Category (example : Domestic Travel Expense) Here is what I did on my end

And unfortunately, this is what the result shows,

and if I select Period this is what's showing

But on our record, we have an Expense Report with the category selected.

I am open for suggestions in case there is a simpler way to do this. Thank you!