Adobe Acrobat Pro drag and drop into combine files converting files instead

Hi everyone,

I use the Combine Files function in Acrobat a lot, but I'm at my wits' end with it. More often than not, when dragging and dropping a file or files into the combiner, it closes my combiner tool and converts/opens all the files I just dropped into pdfs. I realize I can use the "add files" button, but most of the time, I have several file explorer windows open already so it makes it so much easier to grab the files I need instead of navigating through a single window for several files. 

My main goal here is to figure out why this happens. I thought maybe it was if I drug the files into a blank space, so I started making it so the little blue line is between files already there but still persists. My second guess is if Adobe isn't running correctly/not-responding, but task manager only indicates a spike after the files are dropped, which is just from the effort to convert the files. 

Thanks in advance for any tips on aproaching this.  

Noah