Widgets dissapear after hosting move

After what seems to be an almost perfect move to a new host, the only niggly detail that I can’t figure out are my missing widgets.

My front-end (https://www.gavan.ca/) shows the default right column set-up for my theme. On the back-end, all the widgets that I was using prior to this move still think they’re in use (i.e I am not able to add them and they appear when the “show used widget” drop-down box is selected).

I suspect a database issue, but would entertain any suggestions on how to fix this.

Thanks!