Hi @Nolan Lemuel Augustine ,
the Azure Cost Analysis Forecast is just an estimation of costs if the consumption will be the same like before.
The calculation of the forecast is based on historical consumption in the past and not based on the current active Azure resources, if there are any.
Some more details you will find here: Forecasting
(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)