Saggy Floating Shelves

[Quilted]

I bought a couple of floating shelves from Homebase and they sag.

I'm not sure what is causing them to sag, however I'm sure I've installed the bracket without contorting it so I think it's the shelves themselves.

Is there anything I can be doing to get them fixed?

 

[foxhole]

They only sag if the base plate is loose or not secured flush and level to the wall.[or you install it upside down.]

 

[xr4x4]

up, done that by mistake.

metal back plate should have fixing holes for the shelf at the bottom of the poles.

 

[Quilted]

Taking your advice that the bracket may not be properly fixed to the wall I removed both and made lots more holes trying again.

I now have a messy wall to fix, however the large top shelf is now perfectly level - I've checked with a spirit level. The bottom shelf is not, but it's not visibly bad. The bottom shelf has a support that's clearly not suitable for purpose, the poles are far too short, the top one is better.

However they both appear to be perfectly level to the eye.