Hi,
From what I understand you've activated the "actions as a button" setting of the mass action so that you get a button with the name of the mass action on the backend products listing.
And you're then using this button on the products that you select in the listing.
As the name of the setting implies, the button will only run the actions of the mass action on the product you select in your backend.
When you run a mass action with the "process" button, you don't select any product, so by default, it takes into account all the products. Thus, filtering is necessary.
We figured that there is little point in running the filters of the mass action when using the action button since you're the one selecting the products before clicking the action button.
So, if you select 93 products on the listing and click on the action button, the actions of the mass action will run on the 93 products, regardless of the filters configured in the mass action.
So it is not an error. The system is meant to work like this.
If you need to filter the products based on their name, you could just use the search input field at the top of the products listing to first filter the products listing, and then only select the remaining 35 products before clicking on the action button.