The horrible gap between this ceramic tile and the wall is not normal.
Tile is level wall is not.
Now going along the wall hold up a tile to the wall and mark on the tile where the line is.
The existing surface needs to show some sort of roughness that will facilitate the bonding between the new adhesive and the old surface.
While doing this number your tiles as you go so you will know which tile goes where.
Many walls are somewhat uneven.
That way any warping of the tile out of level occurs lower on the wall where it is not so obvious as at the top.
The other alternative is to run the wall tile doewn behind the floor tile with a 90 degree corner there.
If not you can level the surface using a grinder sander or a tile level system.
They may have settled or bowed over time or the plaster may be rough and uneven.
If a wall tile is uneven the mastic holding it in place was not spread properly.
The way i would approach this would be to get your top row correct and level then work down to the floor.
It s really important to start laying your field tiles so the faces are level.
It is extremely important to level the surfaces.
Now using a level make a line on your wall all the way around the area you ll be tiling.
Create a rough surface to improve bonding.
How to tile an uneven wall.
If not it s time to get cutting those tiles.
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Once you reset the tiles you need to.
And specifications so each contractor would know the level of quality.
To repair uneven tiles you need to remove the tiles and repair their base.
If you re tiling over an uneven section of wall the.
Take the tiles to the tile saw and make all the cuts.
If it s straight you can use it to align your tiles instead.