Can't move things when comments are up in adobe express

I noticed that I can't move anything (images, text, etc) left or right with the arrows button, when comments are up on adobe express. Is this a normal thing or is it just a weird bug? 

I was making a poster on adobe express and was trying to slightly adjust an image with the arrow keys, but it wasn't working. I got scared that something broke or crashed and I was gonna loss my work, but it turns out that it was just because I had comments open.