The spreadsheet settings govern the WhatsOrder page. On your computer, please change the spreadsheet timezone to your local timezone, and this will solve the issue.
Kindly refer this official Google Support page for more details.
This is an issue with the settings of the browser. Try going in to settings, apps, all apps, clear the default for your browser. (Force Stop the app after clearing data and cache)
If you opened the link in Firefox, an Android icon will appear to the right of the address bar at the top. Click on it to open the link in the corresponding app. - Source
You can type wa.me/your-number in the browser to check if the link directs to WhatsApp properly.