Well I can reproduce some of it, but doesn't sound as severe as you describe it.
Basically anything from a single tick can only apply either planet core damage, or block damage.
If a single tick does 1 000 000 damage and you hit a planet plate, it will apply any remaining damage through the planet core and then hit the opposing plate where it further applies its remaining damage.
If that hits a planet core directly, it goes straight into it.
Not a severe issue though, beams fire 5 ticks per burst, at least some of those ticks will hit the planet core directly and deal planet damage.