Lightroom loosing focus in OS after deleting an image

I own a MacBook Pro 2017, 2.8GHz i7, Radeon Pro 555, 2GB dedicated ram, + Intel HD Graphics 630. 

When I press delete (MacOS) on an image, I literally have to refocus the OS again on the application to perform the next function, like any action, for example pressing the right arrow to move to the next image. If I don't click on lightroom again, somehow the OS has lost focus and I get the alert sound MacOS makes when an operation isn't allowed. In order to do anything in Lightroom again, I must click on Lightroom, or command-tab back to the app. Please, someone tell me I'm doing something wrong and that the Mighty Adobe doesn't make such massive and atrocious mistakes in their releases. I've had this problem already for several months now.