I always had this problem back in the day when they were in newspapers etc. I didn't really get what people were seeing, because to me it was all in reverse. I looked at these on smaller screens last night (phone and tablet) and I could see them! But just now I tried on my 27" workstation monitors and I got them reversed!

People have pointed out that these are "straight eye" rather than "cross eye" ones. So my theory is on a big screen these are too wide for my eyes or something. I can always go cross eyed (by looking at my nose), but I probably can't go "wide eyed".