Villagers taking the same job at the same station causes issues

So I was trying to get some villagers from a village thousands of blocks away and when I got them close enough to my base, they took the same job as a fisherman and the game crashed and when I rejoined  my lead I was using on the boat they were in was gone, so was my boat and the boat the villagers were in and the villagers. I have no idea why this happened and was very frustrating.