Reylocann, do you have the actual reversed clowns in front of you, or are you basing your query on the box pictures?
I ask because box pictures are sometimes deliberately reversed to make them fit better. Normally it wouldn't matter, but with an assymetrical clown such as this one it shows if you are keen-eyed. The clown inside the box may be normal (if a clown can ever be called normal).
The clown in 3513 is playing a violin-like instrument (actually a rebec), and more than 95% of the time of these are played with the bow in the right hand and the instrument in the left. You can have a violin (or viola or cello) set up* for left-handed playing, but not all left-handed musicians play left-handed because they're usually taught the right-handed hold first. If the person setting up the photo was not a musician they could have got the instrument in the wrong hand, and the photo was later reversed to correct it.
* For those who are interested, it's relatively easy to switch the strings on a guitar to make it left-handed, but for a violin or similar bowed instrument is more complex, as the bass bar, sound post, nut, bridge and fingerboard all have to be changed to make it properly left-handed, not a job for an amateur. Having done that expensive process, the instrument is then much more difficult to sell on because 95% or more of players won't want a left-handed fiddle.
Next time you see an orchestra, count the number of left-handed players.