It's not a surprise, that's normal. Durability just means writes are safe, how it does so doesn't matter. All databases use a write-ahead log with small batch/async flushes and this is the same with MemSQL.

The enterprise edition has HA so with data on 2 nodes for safety. Otherwise you lose the whole point of in-memory performance (for writes) if you're going to write every single bit to disk immediately.

They explain it clearly on the durability page: http://docs.memsql.com/docs/using-durability-and-recovery