I have (had) exactly the same settings of Cazadividendos except for the ads being every 10th post and both Android and IPhone users reporting the same behavior (specially on mobile Chrome).
Actually, I suspect the same thing happened in desktop version, but since there’s so much more vertical area you can still find it visually without having to re-scroll the whole time.
If you wish I can activate it and you can see for yourself, would that help @neil?