Bananas emerging from bud sites in week twelve or thirteen mean the plant is under stress or the genetics carry an unstable trait. Light leaks, heat spikes and interrupted dark periods trigger it most often, and a long cycle simply gives more opportunities for something to go wrong. Stability notes across different lines are discussed at https://hazesativaseeds.com with grower observations. Pulling them by hand works if there are few, but seeds will already have started forming nearby.