jansass GmbH on "[Plugin: Wordfence Security] What exactly does Falcon Engine? Questions on features, XMLRPC, options, cache.."

I have WF Falcon enabled in around 14 installations and every single of them reports most of the time:

"The cache is currently empty. It may be disabled or it may have been recently cleared."

Why? Of course i have not cleared the cache and af course Falcon is enabled. And yes, there is a caching effect measurable, but im little worried about the display (latest version)