Got quite excited about Canonbie Kirk Sessions on SP
Until I tried it out
I had the same response when I found that Balmaclellan kirk sessions were missing too 
Don't despair.
I sent SP a message thanking them for putting the KS records online, and their reply said, "We're so pleased to have been able to make the kirk session records available online, and are looking forward to being able to use the system to add further batches of digitised kirk session, presbytery and synod records in the coming months".
So it looks as if they are still working on them, and there will be more to come.