If it wasn't this Valvoline ATF it was likely not the correct one:
https://www.walmart.com/ip/Valvoline-Im ... /267514995
Sorry to be the bearer of bad news.
The regular valvoline is not the right spec... its not like its poison to the tranny like coolant would be, but you should replace it completely.
(have you replaced or bypassed your radiator yet?)
Another proper fluid is
https://www.walmart.com/ip/Castrol-Tran ... /176732896