If the abnormal growth only occurred recently, the cause is probably cultural. Excessive use of fertilizer can cause the fusing of new leaves or apical growth. Your leaves are not especially dark green, so this may not be the case. Certain pesticides can also cause stunting or abnormal growth (sometimes in conjunction with fertilizer).
If your plant has some sort of unusual growths in the past, the cause might be genetic.
Cloning (and for that matter, seed culture) can result in mutations if not done properly or responsibly. Many times strong chemicals are used to proliferate orchid clones more rapidly. If a mutation occurs early on in the process, then many or most of the resulting clones may be mutants also. Sometimes, tens or hundreds of thousands of clones are made from a single cutting of a source plant. This enhances the risks. Sometimes certain source plants are somewhat unstable in the cloning process, which can also lead to unstable clones.
Repeated recloning of unstable clones can lead to disaster.
Careful and responsible cloning procedures produce good stable plants. So let's not burn all the people with black clothes and carrying brooms. And let's not throw out the baby with the bath water ... etc.
Clones can be a very good source of excellent material. They might be the only way for many hobbyists to get specific plants.
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