Shortcode not working

[wpt_productions limit=”5″?start=”tomorrow” ]{{thumbnail(medium)|permalink}}[/wpt_productions]

I would expect the above shortcode to give me the next five productions, in date order.

But what I get is a mix of productions that are in the past, and some future events.

The section that shows on the home page, the output from this shortcode: https://www.centralcinema.co.nz/wp-content/uploads/2019/08/coming-up-5-AUg.jpg
The event list showing events coming UP: https://www.centralcinema.co.nz/wp-content/uploads/2019/08/events-coming-up.jpg

What am I doing wrong?

The page I need help with: [log in to see the link]