They had a problem.Ricky W hadn't been able to do enough work and the routine wasn't that good and even repeated itself to fill the time with no more learning needed. If they gave him less than 32 it would have sent the message he was falling fast down the leaderboard and they would have had difficulty with the rest of their marks giving Nathalie and Ricky G less than him. They didn't want that negative story sent yet. Similarly if they gave Ali more than him it would look like the order had reversed and make her the new front runner . They undermarked Ali and overmarked him and put them both on 32.To do that, as they couldn't say anything about Ali's technique, they claimed it was her performance (which is OK on every shot I can see enough of ) or implicitly the choreography. They then threw two people above them in the order, so it ended up looking like there was a real competition at the top. Leila possibly belonged there - Zoe looked overmarked, again.
Thats the complicated solution. The more random one is that , as with Lisa, they see something there thats not with Zoe , they don't know how to mark for difficulty fairly, they are marking Ricky W on reputation and Len's marking is often random anyway.