Popup looks like it is displaying incorrectly because Divi is setting z-index somewhere on 3 different selectors:
div.et_builder_inner_content.et_pb_gutters3div.et_pb_section.et_pb_section_0.et_section_regulardiv.et_pb_column.et_pb_column_4_4.et_pb_column_0.et_pb_css_mix_blend_mode_passthrough.et-last-child