Interesting to see how many platforms seem to be shrinking their loan volume when they need growth to justify lack of profit. Quite worrying really.
The monthly volumes on most platforms are quite volatile. For example the -97% for SS may look alarming. However I see no reason for worry concerning this platform (at least in the near furture). Also depending on loan types there are seasonal effects. And for small platforms (e.g. <1M/month) the percentage fluctations do not translate to much in volume in absolute numbers.
But you are right that it makes those platforms look more stable/predictable that manage to generate a steady volume of loan volume - especially the top 3 in this chart Ratesetter, Zopa and Funding Circle. Would Prosper and Lending Club disclose monthly figures, the same would apply for them.