Rebaseline process and data verification

[sooghtac]

Hi there,
New to the forum.. and need some help.
We've been rebaselining projects for years and downloading into an excel sheet that captures the data into a graph displaying cumulative original baseline, cumulative % complete, and rebaseline schedule when required.
I didn't write the procedure on baselining, however my team assure me they're the same as the past 2 years but only has the graphs recently showing the re-baseline not looking correct. If you rebaseline a schedule, it should pull through actuals to date. If you have a look at the attachment I have, you will notice the rebaselined schedule drops off in November quite significantly not following the % complete.
I've included the original and rebaseline data and copy of schedule.
I've also included our instructions.
Hopefully someone is able to identify what is going wrong!
Thanks in advance