This happens when the filters popup opens.
JQMIGRATE: jQuery.fn.offset() requires an element connected to a document migrateWarn jQuery.fn.offset OO.ui.Element.static.getRelativePosition mw.rcfilters.ui.FilterTagMultiselectWidget.scrollToTop mw.rcfilters.ui.FilterTagMultiselectWidget.onInputFocus ...
Note: ooui might be the place to fix this but it might also be caused by our usage since some of our widgets are customized maybe more than they should be.