The request does not convert data from UTF-8 to FLOAT

Hello everyone.
Here is the following request:

SELECT 
  SUM("slotRenderEnded"::float) slot_Render_Ended, date_bin(INTERVAL '$GROUP_BY_TIME_SQL', time) as time, extension
FROM 
  "productionAscScrollViewabilityDebug" 
WHERE 
  "time" >= $__timeFrom AND "time" <= $__timeTo
AND state = 'completed'
group by 
  extension, time
order by time

The following request outputs the sum of slotRenderEnded at each time interval. The problem is that instead of displaying the sum of all values in a single time interval, only one value is displayed. Could you please advise if this could be an issue with data conversion or with the request itself?

Welcome to forum

Click on the query inspector and what do you see for raw query