Wrong block selected when farming

When trying to plant a seed on a farmland block in front of an already existing plant (wheat for example) is that's selected in place of the block.

-Choose the block where planting a seed: https://www.dropbox.com/s/dix7gky8odw9kc4/wrongselection1.jpg?dl=0

-This is the wheat plant who's selected: https://www.dropbox.com/s/byf5t90h4lxicll/wrongselection2.jpg?dl=0

When trying to plant a seed on a farmland block in front of an already existing plant (wheat for example) is that's selected in place of the block.

-Choose the block where planting a seed (1st picture)

-This is the wheat plant who's selected (2nd picture)