If thats a DJ Short Blueberry they are known to have some mutants and the "crinkle". If thats DJ Shorts gear I would say your plants are just fine believe it or not. Do some research on google and Im sure you will find plenty of info about mutants in the Blueberry line.
I suggest before you do anything different to that plant than you normally would you join ICMAG, post your pictures in the DJ Short/Legends forum and wait for the experts to tell you what they think. They all have grown many blueberry strains, and who knows maybe the breeder himself will answer you.
Im like 90% sure there is nothing wrong with your plants at all, but I think you should ask them first. That crinkle happens all the time and Ive seen it myself.
Its also known to happen in the Dutch Passion Blueberry
check this thread out
http://www.icmag.com/ic/showthread.php?t=86548&highlight=mutants