Sorry about that. It looks like the issue is that you have merged calls and cells that contain both letters and numbers. If you move the count to after the model name it should work with how you are using Numbers now.
"In columns containing both text and numbers, ascending order sorts numbers before text (for example, 1a, 1b, 2a, a1, b1). Ascending order also places Boolean (true/false) cells after cells sorted alphabetically or numerically, and places blank cells at the bottom of the column."
I strongly recommend using categories as I said before to avoid that. I believe in the long run this will be much more useful for you. Especially if you are trying to find items or services that bring in the most profit or present the largest cost or even if its just general inventory.
Heres an image of what I mean.

Note: The Column A count is not fully accurate when using categories like this.
I made column A and column "Type" both categories which allows custom sorting and more flexibility.
I also recommend checking these YouTube videos.
Mac Numbers Filter Tricks To Make Your Spreadsheets Easy To Use
Building a Basic Business Spreadsheet In Mac Numbers