@Sue326
It's there. If I search for 'Riviera del Sol Paradise, Málaga, Spain' and use the number of guests, price and beds filters I can see it.
What this means is, there are lots of apartments in the area and yours isn't near the top of the ranking. To move up, you need to get some reviews.
Also, there appear to be lots of different ways to write the address - Mijas, Mijas Costa, La Cala de Mijas, etc - and I'm wondering if that could be an issue. You might want to look to see if there's a pattern. Perhaps the top of the list properties all use the same style of address?