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Since you never gave us any further info, I'll just assume this is the form you're working on 70562746608361.
I don't see any issues on a cloned copy of that form. Deleting/adding/changing works as intended. Here's how I saw it from my perspective:
If you're using a different browser, I'd highly recommend you use Chrome. If that doesn't help, clear Chrome's cache and cookies first. After all that and it still won't work, try with Chrome Incognito.