I was curious enough about the problem (I used to test software for a living waaay back when) that I thought I would chase it further.
I restarted Level 245 many times, until I had multiple snake heads of the same color (purple in this case). There were four, one of which was exploded by lining it up with purple jewels. Then there were three.....
I continued to play, and at one point had a diamond next to a purple blaster (first screen shot). On swiping the two I got the result in the second screenshot. Note that none of the three remaining purple snakeheads exploded; they remained intact.