Looks like you Turned on some show Flags by accident? In your Viewport click on the “Show” Button and than “Use Defaults”. Aside from that maybe Cull Distance Volumes of any sort misplaced/configured? I got no Clue why it would work on none Perspective Views. Does it work if you change to Game View (Keybord shortcut “G”) or if you close down the Cinematic Viewport?