Problem solved: Apparently I added the Second Edition a few years ago, and adding the Fourth Edition as Currently Reading didn't overwrite that and gave priority to that. I'd consider this a bug. I worked around it by removing the book and adding it again, which now reflects the Fourth Edition I'm reading on the main page.
Can you update Linear Algebra Done Right for 4th Edition? In "Search books" textbox, I entered the ISBN 9783031410253 and it correctly found Linear Algebra Done Right and I added to my 'Currently reading'. But when I visit the Goodreads main page, it shows as if I'm reading the second edition: https://www.goodreads.com/book/show/309768.Linear_Algebra_Done_Right.