Text widget issue – clearing sidebar

Very new to this.
Trying to use text widget to put an image and text which will link back to a page on the site (a fundraising link). However, when I move the widget to be the top widget in the right sidebar of a Weaver themed website, it pushes all the widgets below this off the sidebar and beneath my bottom post, but above the footer widget.
This is what happens. Any help welcome
https://www.heywoodcc.co.uk/