RECURSIVE in SQL for more complicated queries (date interval related)

Goal: to create a recursive query that gets the last 3 months of a table and sums them for every 3 months back 3 years.

I have a big table but it has sales price as a column and sales date as a column. I want to sum the sales price for all dates in-between now() and the last 3 months then again for months 3 to 6 and again for months 6 to 9 and on all the way back 3 years.

This is the code I have written so far it seems that SDATE1 is iterating the right way but my totpaid is not

WITH RECURSIVE PARAMS AS (SELECT '07/01/2023' SDATE, '05/01/23' EDATE), --(this is going to be put in to SSRS so I am hard coding SDATE to with) 

 CteRecursive(SDATE1, totpaid, datereceived) AS (
    Select *
    From (
    select (cast((SELECT SDATE FROM PARAMS) as TIMESTAMP)) SDATE2, sum(totpaid),Datereceived
    From adjudicationresult ar
      where Locations = 'GRE'
      GROUP BY Datereceived
     ) cte
      Where Datereceived <= (cast((SDATE2 ) as date)- (INTERVAL '1 Month' ))
        and Datereceived >= (cast((SDATE2 ) as date)- (INTERVAL '3 Month' ))
--**This is where I think I went wrong trying to get SDATE2 to update

  UNION ALL
    SELECT (SDATE1 - INTERVAL '3 MONTH') SDate3 ,totpaid, Datereceived
    FROM t
    WHERE SDATE1 > (cast((SELECT SDATE FROM PARAMS) as date)- (INTERVAL '12 Month' ))
    GROUP BY t.SDATE1, t.totpaid , t.Datereceived
)
SELECT Sdate1, (totpaid), datereceived
 FROM t
ORDER BY TotPaid;

my results are

Or if sorted by sdate1, daterecived

My Questions are why did it loop for the same days for each sdate1 (ie 2023-01-01:2023-04-01 ect)
and why did iterate over each day instead of summing the whole quarter

A more conventional, and likely better performing, approach is to generate a series of date ranges, then aggregate via those ranges. e.g:

SELECT
      r AS start_date
    , r + INTERVAL '3 months' AS end_date
    , sum(totpaid)
FROM
    generate_series(
        CURRENT_DATE - INTERVAL '3 years',
        CURRENT_DATE - INTERVAL '3 months',
        INTERVAL '3 months'
    ) AS r
LEFT JOIN adjudicationresult AS s ON s.Datereceived >= r
                                 AND s.Datereceived < r + INTERVAL '3 months'
GROUP BY
      r
    , r + INTERVAL '3 months'

See this demonstrated here