My empty level has memory allocated for non existent blueprints

I have created an empty level with the project game mode set back to the default " Game Mode Base". When i play and run “memreport”, i noticed there are memory allocated to some blueprints which are not found in the level at all because the level is empty. As i reopen the empty level, the count of those blueprint increases as well.

Any idea what might be causing this issue?

Hello,

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Thanks