Unload command added more decimal places to float4 field

I have a table with a float4 field, and one of the values is 120.12 When I unload the data to a file in S3, and look at the file in a text editor, the related field now has the value 120.120003 I.e. it has made the value more precise by adding 4 more decimal places, and then (randomly) making the last decimal place a non-zero value. This is happening for many database records that I am unloading/exporting.

Why is this happening, and what can I do to prevent it? Is it because I'm using float4 and it has "6 significant digits of precision"? Is redshift just adding in extra precision because I used float4? If so, should I be using DECIMAL(8,2) instead? I have used float4 previously without this issue when exporting/unloading.

An example of the create table query:

CREATE TABLE exampleTableName (
  id       int identity(1,1),
  accId    varchar(16) encode zstd,
  amount   float4,

  primary key(id)
)
distkey(accId)
interleaved sortkey(accId);

The unload command:

UNLOAD ('YYY')
TO 's3://bucket/prefixFile_'
IAM_ROLE 'XXX'
HEADER
ADDQUOTES
PARALLEL OFF
MAXFILESIZE AS 5gb
DELIMITER AS ',' 
GZIP;