I looks like they didn't clip together properly. They may have come apart because the surface underneath isn't flat. If this is the case, dissassemble the floor and pour some floor leveler. If it's cheap flooring the locking system may be inadequate and just didn't hold together.
The cheap fix would be to get the color-matching stretchable filler, but those are more used for holes; I think it might introduce more problems when the floor shifts.
I looks like they didn't clip together properly. They may have come apart because the surface underneath isn't flat. If this is the case, dissassemble the floor and pour some floor leveler. If it's cheap flooring the locking system may be inadequate and just didn't hold together.
If I’ve got multiple places with these gaps am I looking at essentially redoing the whole floor?
The cheap fix would be to get the color-matching stretchable filler, but those are more used for holes; I think it might introduce more problems when the floor shifts.