I feel your pain. I switched to KeePassXC, and will never use an online password manager again.
For a password management company, they can't even be bothered to fuzz their export functionality. QuickCheck works unreasonably well on `import(export(a)) == a`.
But maybe it's intended to be buggy, in order to keep you in their walled garden. Clearly the sync between devices works, so they have solved this problem.