I'll take a guess. The original saddle is the worn ridge supporting the new shinny saddle, so the scale length has been lengthened by the thickness of the new saddle. I've made drop-in bone saddles like this (the slot filled by the support piece with the back extension sitting on the bridge itself) to correct the intonation of classical guitars. I haven't a clue what the second picture is, but somehow it reminds me of an "Aliens" movie.