Mac OSX Yosemite 10.10.4
MacBook Pro (Retina, 15-inch, Late 2013)
Processor 2.6 GHz Quad Intel Core i7
Memory 16 GB 1600MHz DDR3
Details to recreate issue:
Set locators to 1 and 9 (it shifts out of place no matter what the locators are set to) and just change the tempo and the locators will change to random values. It does happen overtime so you have to try a couple of times if it does happen the first time.