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I have logged in to your account and I could not replicate mentioned issue. I was able to open all of your forms inside of Form Builder. I tested in Google Chrome and Mozilla Firefox.
Are you unable to open all of your forms? Maybe it was temporally issue. Did you checked your internet connection? If you are still unable to open your forms please try with different browser or device. Which device and browser are you using?
Let us know if you need further assistance.