When I launch Fortnite for playtesting, some of the locations of the placed meshes are messed up. I can’t fix this because it looks fine in UEFN. Additionally, I can’t simply delete those and replace them with new ones because most of them are currently in use in the sequencer.
Update - Okay, so I deleted the old one and placed the new ones despite it being in the sequencer, and it still has the issue. 
Here’s what happened: almost all of those actors were attached to a Parent actor in the outliner, if you know the attached actors have a relative position to the Parent actor. An actor does not have mobility, but the meshes attached to it do, and all of them share the same static mobility. I don’t know what caused the child actors to change position. If any of you know, consider sharing it. Now it is fixed. If you ran into the same problem, consider removing the child actor from the parents. Also, to just figure out what’s going on, I had to wait a lot to get the changes published. The wait time for publishing changes needs to be fixed.
I think the hierarchy gets flattened when the island is cooked. It seems that there are issues where the parent transform (especially scale) is not correctly applied to the children.
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