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if its not overlocking its not threaded right, but if the needle is bent at all it needs to be replaced and can cause stich malfunction or a piece of needle to fly randomly when it fully breaks! you can download the threading diagram if you google your machine... good luck
Probably your looper timing is off. This is common, and just a necessary evil of sergers. Their tolerances are tight.
The operation of creating a serger stitch is a succession of thread grabing and delivering. One looper grabs a thread and delivers it to the needle and so on.
To check this, turn your handwheel slowly and check to see that the upper looper is meeting the lower looper by passing very close to the indented part at the back of the lower looper (indented part is called the scarf, this is where the looper threads form a lock) If not, it's the looper timing. If they seem to meet properly then check your needle. Is your needle up into the needle clamp all the way? Try a new needle. Even a slight bend to the needle will not allow the loopers to meet and grab or deliver thread. You might check the tensions. Thread has to have some resistance in order for the loopers to do their job,
If your looper timing is off, find a sewing repair person to retime the serger. Don't try it yourself or put this repair off. If the loopers go further out of timing, they might hit something and replacement can be costly.