On my last 3 wheat beers I brewed with Safbrew WB-06 they all have finished really sour and stayed that way. It's not an infected sour and the beers I brew alongside with us-05 all finish normally. I have had to use kits recently because I have absolutely no time between work and work. 1 was a dunkelweizen from the beer nut in Salt Lake City, the other 2 were standard weiss kits from the same store. I followed standard procedure, for a partial boil, cooled with a chiller and put them in a fridge with the temp controller set to 62. I then kegged and all three were just sort of sour. Almost tannin sour. As I said before, pale ales in the fridge right beside them fermented perfectly.