Great that you are noticing this! Potato leaf is a recessive trait. It is likely that last year's plant already was bee crossed - it would have carried both alleles (RL,PL) but had regular leaves since that trait is dominant. This year's plants would be the next generation (F2) and 25% PL is the Mendelian ratio (in a small sample size, the number will deviate a bit, hence your 30%). That also means that some of your RL plants this year (also 25%) have two copies of the RL allele and will breed true, and others (50%) will have copies of both RL and PL and will continue to segregate.
These are likely not the only genes that are remixing, so I would grow out all the individuals and compare their fruit. It's all a matter of taste!
