The objects are deleted one by one in like 0.5 seconds interval.
This bug already happened other two times, I guess in all three cases the objects where next to each other, and probably they where deleted in the same/near sequence they where created.
I created some of those objects using Alt+left mouse drag to duplicate them.
The cases occurred both in changes made in the same editor session and with changes made in a different dates.
Thank you for your report! We would like to look into this further, would you be able to submit a bug report using the form available here: Fortnite Creative
@LuiX_47 this is by design. There is a setting in UEFN which can enable/disable the Battle Royale style building method where props need to be anchored to the ground.
This only happens if you have live edit open. Press the assets and under details you ll see the setting shown above.
A quicker way to fix this is to go to live edit, press “Quick Menu”, turn “Building to Prop” to ON (any of the two settings), then multiselect and place what you have, it ll remove the structural system.
Also if you use the building to prop trick, any asset you place/copy, will not have structural integrity anymore, so always place prefabs in Live edit, not UEFN!