It's not that paradoxical in my opinion. The thing you've got to remember is you don't know what's going on with these girls. Their cat might have died, they might already be on and off seeing someone or in an LDR, they might be busy with work, or travelling, or blah blah blah. The point is when it comes to numbers there's a billion factors other than what you do that might affect it. You can mitigate this sometimes, but there's always flakes when you're going for numbers. Once you view it that way you realise it's nothing to really worry about.