Recently, North Kerbin Dynamics got an update in which Harpwner claims he "fixed the explosion effects." Before the update, I thought that the explosions were fine and nothing was wrong with them; the sphere and tall part below it (sorry for not knowing what they are called) would rise up high into the air and the circle-shaped base part would stay on the ground and expand. Eventually, all of the parts would evaporate after about 20 or so seconds. However, after the update, all 3 of the parts would immediately start to sink into the ground and they would never evaporate. Keep in mind that I have not installed or deleted any mods ever since the update. Here are 2 videos of this in action: Video 1 and Video 2. Here are the current list of mods that I have installed:
Adjustable Landing Gear
B9 Aerospace
BDArmory
CAL
Crossfeed Enabler
FASA
Firespitter
FS Hangar Extender
Kerbal Dynamics
Kerbal Foundries
Kerbal Konstructs
HyperEdit
Klockheed Martian Gimbal
Infernal Robotics
MechJeb 2 and MechJeb 2 Embedded
NAS
North Kerbin Dynamics
NovaPunch 2
PEW-R-11
Procedural Dynamics
Procedural Fairings
Procedural Parts
Smoke Screen
SpaceY Lifters
Take Command
TweakScale
Vessel Mover
Virgin Kalactic
WASD Camera Editor