Had this happen several times, usually a refresh fixes it but here’s what is going on:
Summary:
Primary issue: Add button via the content builder > click button to begin editing element settings > page preview jumps to top as if it is responding to the # default.
Similar alt issue #1 Add button via the content builder > click button to begin editing element settings > page preview jumps to top as if it is responding to the # default > add in the button link > click button in preview again and it takes me to that page rather than loading up content builder settings.
Similar alt issue #2 Add button via the content builder > click button to begin editing element settings > select my button preset > content builder scrolls to the text partial before I can apply the preset > scroll back to top > click apply > click save > button does not show on front end > refresh backend > button still shows > delete button > replace button > now it works.
See video in note. Thanks 