Jumping up, the kitten caught the treat is not a misplaced modifier because it describes the action of the kitten. Modifiers are words, phrases, or clauses that add a description.
The definition of misplaced modifier in the dictionary is a participle intended to modify a noun but having the wrong grammatical relationship to it as an example having left in the sentence.
Modifiers are words or sentence. They give us a better understanding of a word or sentence. The dangling modifier is not properly connected to the subject of the sentence, which makes it unclear which word it modifies.