F3 Shows Wrongs coordinates

Just recently I have noticed that when I press F3 to see the coordinates so I can use command blocks to setblock and entered the coordinates it spawned the block in the wrong place.

Upon checking with another player it seems I see different data than they do so it says to me i am on 456 64 456 when they see it as 455 64 455 for example.

I have googled this issue but can find no reference to it.