Why is your latex paint bubbling over your oil based primer on paneling?

Probably the primer surface was contaminated before the topcoat was put on. Another option is that the paint was applied in hot weather, over a surface that was not cool enough to paint over. Still another option is that it was applied with a foam roller using too much pressure. That could have introduced air into the surface.

The fix is to sand the surface smooth, clean, then reapply the paint according to the manufacturer's instructions.