No-one's remotely interested in fixing this. It got worse for me today for no apparent reason. I think it might also be knocking other likes off the posts as I could see a post that had something like "XXXX, yyyy, zzzzz, and 6 others like this", I liked it too, came up as ARG4/6, and all the "6 others" or whatever it was, disappeared. I then unliked and they didn't come back then either. But, I can't be bothered to either find the post, try to recreate, clear cache, cookies, blow my nose, whistle dixie, to help as we can see it is not in anyone's optic.