The movie didn't make any sense because it was pieced together by re-dubbing an old Thai movie and adding new low budget footage of a Robocop clone vs Jiang Shi vampires. A Jiang Shi is a Chinese hopping vampire or zombie, they are well known through out Asia, and are featured in an extremely popular series of movies known as Mr. Vampire. Jiang Shi hop because they are dead and rigor mortis has already set in.
IFD/Filmark International movies are famous for these cut and paste films. They would buy an older film from Thailand, Taiwan, or Korea, and add additional footage featuring ninjas, re-dub the old footage, and attempt to fit the two together. Godfrey Ho and Thomas Tang made a ton of movies this way, they'd be credited as the director even though they only really directed the new footage. The director of the other movie that the footage was borrowed from would never get credit on the finished product. They probably wouldn't have wanted a credit anyway, because their original movie was usually drastically altered in the process.

I picked this set up new at a Half-Price Books store the other day and this was the second movie I watched. It left me wondering something when it was over.
What the hell was that?!
Nothing in that movie made any freakin' sense! So many subplots, new characters coming in as old ones suddenly stop showing up, and I think people you see get killed off showed up again 5 minutes later in the same outfits fighting for the other team
I did enjoy the 14 people in a Willys Jeep scene. The only thing missing was calliope circus music playing as they drove up and started hopping off of it.
and speaking of hopping
What the heck was up with those vampires?!
Hop! Hop! Hop! Hop!
Fabric-armored cyborg kept shooting at them and they'd vanish after about 10 hits, then show up again. Here's a thought, how about trying something else? You know maybe stake through the heart, holy water to the face, crucifix to the forehead.
Director
: "Now that "Scorpion Thunderbolt" is completed, I want to create a vampire robot movie with ghosts and drug lords. I'd appreciate you approving my application."
Producer
: "You're assured of success?"
Director
: "Yes."
Producer
: "Okay, it's approved."
He did 17 movies that year. I wonder if any of them were any good
Of course, it did have one thing going for it. The vampires didn't 'sparkle'.
Don't ask me what I think of you,
I might not give the answer that you want me to.

• Fleetwood Mac, "Oh Well"