From inspecting your site I do see Auto ads placed on your site, along with a normal amount of ads on your site overall.
If you manually inserted multiple single ad units there may be cases where Auto ads will not appear, if AdSense logic determines there are already enough ads on your page.
If you’re not happy with the placement of Auto ads on your site you can always use a plugin such as Advanced Ads or AdInserter to place single ad units across your site – the same ad units used in multiple positions.
Let me know if you have any further queries on this. For more AdSense focused questions you made find better results using the official AdSense Help Center. And be sure to share your thoughts on the plugin so far if you get a chance – Alberto himself responds to many!