Filter not working properly with some tables

MWE:

```julia
using DataFrames
using TableTransforms
using CSV

htable = download(
	"https://zenodo.org/record/7051975/files/drillholes.csv?download=1"
) |> CSV.File |> DataFrame

drillholes = georef(htable, (:X,:Y,:Z))

drillholes |> Filter(sample -> sample."Au ppm" > 0.9)
```