Why is Jiraiya’s headband different from that of other Leaf Shinobi? The Headbands Ninjas Wear Symbolize who they are Loyal to.
Then why Jiraiya, a leaf shinobi has different headband?
The symbol on Jiraiya's headband translate to 


  "oil" (油, abura)


The reason why Jirayia wears this symbol on this headband rather than the leaf symbol is to show his affiliation with the toads on Mount Myōboku


  He often carried a large scroll on his back, and had a tattoo on his left palm, and he wore a horned forehead protector with the kanji for "oil" (油, abura), which denoted his affiliation with Mount Myōboku.