Cant remember the amount of times I'll be getting a throw from the out field onto 2nd, 3rd or home plate where I go to dive tag the runner and my fielder dives the other way. Hope they correct that in 19
I hope so as well
I think it's done on purpose, especially at first base. There is a bad runner animation where they drift off the bag sometimes and have no awareness the ball is near them. It's kind of cheesy to get a runner out that locked into an animation the user didn't control. So, if you attempt to dive at the runner with the ball your fielder gets repelled like a magnet.