4th ad doesn't show

[Eva]

I don't know if there's a limit somehow but it seems I can only display 3 ads per page 

If I add three small consecutive google ads below the main menu then the wide google ad doesn't appear at the end of the page... If I delete one of the small ones then the ad displays 

I don't know if this is a limit by google or is a bug but can someone please help me? 

[ccbtimewiz]

I'm 99.9% sure it's google.