New build problems

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Good evening everyone.
I'm writing here seeking advice regarding some problems of a new build flat that my partner and I recently purchased.

Floating floor problem:
the flat use a floating floor system with an acoustic absorber layer underneath. The main issue is that the floor is really bouncy and uneven!
When we walk around the flat, the furniture rattle and move under our weight (~50Kg); not considering the washing machine that creates so high vibrations that we can feel them 5/6 meters away (and shake considerably the fridge nearby).
The developer's surveyor and the builders say that it's normal and nowadays all the floating floor system are like this, but in my experience, I've never felt something so weak.
Is it normal for a floating floor system behave like this?

Sound insulation problem:
The flat it's in a building adjacent to a pub. For the part E regulation, the two building need to be separated?
The main issue is that we can hear the pub music from every wall of the pub side, even if we are on the 4th floor and the pub it's only on the ground floor.
Our guess is that being the building connected on the ground floor, the sounds vibrations get transmitted through the building walls carrying the music to all the flats.
We asked for a sound test between the pub and the flats but none was done.
There something that we can do?

Also, someone knows other forums where seek advice from builders?

I hope that this explanation makes sense
Thanks in advance for any reply.