How can i fix my meshes from doing this split thingy

Hello I was making a little game until I got a Bsod (blue screen of death, but I don’t know if that has anything to do with it) and when I got back on the engine meshes started splitting up like this I’ve checked if it was a problem with lighting but I couldn’t fix it in any way if you know how to fix it please let me know.

Here is the issue

one other thing in the static mesh editor this issue doesn’t happen

I figured it out I just needed to update my Ue4 to 4.20

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