I've just started tiling a new floor in an extension. The floor is
treated chipboard (Caberdek) and is well secured down and nice and
flat.

As an adhesive I got Unibond "Tile on Floors" Waterproof Adhesive.
It's a powder and its not a rapid set type.

I laid the first tiles last night and out of curiosity I tested
whether they are stuck.
But they feel "bouncy". If you get down to floor level you can
actually see the tiles move up and down (at the edges anyway) as you
move on them.

Is that normal for an adhesive meant for tiling directly onto wood?
I've only ever put tiles onto concrete floors before.

Cheers
Painters10