Where did you sample from?
A: a bottle that you just filled on same day as bottleing
B: bottleing bucket that has your priming sugar in it
C: Hydrometer Sample before you racked to the bottleing bucket
D: left over from the secondary vessle
I'm not sure you could have a lactobacillus infection from bottles so quickly if you're sampling from A, but if it's been in the bottles for 2-3 weeks yeah
What did you do for sanitation while brewing this? Perhaps the vessle you used for Secondary wasn't sanitised as well as it could have been.
I see posts about not doing anything in the same place that you grind grain as well. so if you racked in the same room that you grind your stuff..