@john john Did you delete the App Service Plan when you deleted the web app? It should've prompted you when you deleted the app, but I wanted to double-check because if you left the plan you will still be charged.
As to your question, if not all charges have posted for a deleted service, then yes, it would be normal to see new charges for a deleted service. Whether or not that is the full explanation for the increased amount you are seeing I don't know, since I'm not looking at your data and don't know precisely when each of your screenshots were taken nor do I know precisely when you deleted/stopped services, etc.
Please look at other views besides what you posted as screenshot for more details. For example, in Cost Analysis, at the top select View: CostByResource
![azure cost analysis cost by resource](https://learn-attachment.microsoft.com/api/attachments/dff38fb6-3883-4d58-a5f6-39fa442b7ea8?platform=QnA)
Next to the View option is the date filter. You can use that to only show a specific day or range of days using Custom date range option. In this way you can drill down and see which resource(s) have been accruing charges each day.
Your original screenshot showed you had Standard SKU App Service plan, which costs about $73/month, which was pretty close to your forecasted total for the month. Assuming nothing else changed if you deleted that app service plan most of your forecasted costs should be eliminated.