1. SG Optimizer Plugin Blocks The WhatsApp Widget From Displaying on The Website
If you are using the SG Optimizer plugin on your website, then you might face this issue, because the plugin has got some added features which block the WhatsApp scripts from rendering properly.
Solution: Exclude the WhatsApp plugin's script from these three locations as shown in the screenshots below:
A screenshot showing SG Optimizer features
If you are using the WhatsApp PRO version, add the following scripts to each of the three sections of the SG Optimizer plugin;
If you are using the WhatsApp free version, then this is how the path looks like for you, hence you should add this and not the one above;
A screenshot showing WhatsApp plugin's scripts excluded in SG Optimizer settings.