I have my own personal account with lots of workspaces. Recently I joined a team where a team member shared his collections. I left that team and it wiped all workspaces in my personal account too!!
Hey @vamshins 
Welcome to the Postman community! 
Can you walk me through the process of joining the team, do you select the option to keep your data separate or move it to the new team?
We you left the team, did you action that from the team settings or was that the Admin of the Team?
If it was you that left, did you assign another team member you’re Collections, as part of that leaving process?
When you leave a team, the process would be something like this:
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