Hello @Suraj Kumar Boity ,
Thanks for posting your query on Microsoft QnA.
As you mentioned, Stop action is showing as Deallocate in Activity Logs. You are correct, Stop action corresponds to Deallocate operation itself in Activity logs, so you are seeing it right.
Hope this helps.
------------
Please don't forget to "Accept as Answer" and "Upvote" if you think my response was helpful.