I'm seeing a sort of double search icon in the Indigo client app--but with slight inconsistency. This is what I'm seeing:
Development: device search box, variable search box.
Production: variable search box (but not device search box).
I suspect that this is a bug in Cocoa (both boxes on Mojave upgrade path -- 10.14.1), but it does look normal in other places like: Mail, Reminders, and Calendar.
EDIT: I should add that restarting the server, application, and Mac did not clear the condition.