There you go. From what I can gather, it seems that when I pressed the Like button, instead of liking the comment, it redirected me to a page ending with "posts/3821027/like" (the Like button contains this link), which is weird because it normally doesn't do that. I don't think it is because of me using Edge on my phone (Lumia 640 XL / W10 Mobile), because I have liked comments before on this device, without being redirected to a special page.
Still, I tested it just now on another thread on my phone. Rate and Like features worked fine, no redirections and I got the confirmation almost instantly, without refreshing the page.
EDIT: I had to check the browsing history to get this info. So, I can't really replay whatever caused this to happen.