To repair uneven tiles you need to remove the tiles and repair their base.
Tile is level wall is not.
If not it s time to get cutting those tiles.
If it s straight you can use it to align your tiles instead.
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.
Take the tiles to the tile saw and make all the cuts.
It is extremely important to level the surfaces.
How to tile an uneven wall.
If a wall tile is uneven the mastic holding it in place was not spread properly.
Now using a level make a line on your wall all the way around the area you ll be tiling.
The horrible gap between this ceramic tile and the wall is not normal.
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Many walls are somewhat uneven.
And specifications so each contractor would know the level of quality.
They may have settled or bowed over time or the plaster may be rough and uneven.
Use a long straight batten levelled with a spirit level to find the lowest point.
The way i would approach this would be to get your top row correct and level then work down to the floor.
The existing surface needs to show some sort of roughness that will facilitate the bonding between the new adhesive and the old surface.
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.
Create a rough surface to improve bonding.
The back of the tile should be flush with the wall.
Once you reset the tiles you need to.
Fixing whole tiles to a wall.
While doing this number your tiles as you go so you will know which tile goes where.