I don't know why, this is just what I think could happen.
A perfect Elliot 12345 Wave to 999 sats today 4th Jan 2018 followed by what I believe shows could be a dip to 750 sats in an Elliot ABC correction near the low 4 of the prior Wave 4. Things to note: Wave 2 correction was sharp! Wave 4 correction was flatter!