Osmc on raspberry pi 3

thought osmc had leia 18 for pi 3. when i installed its 17.6???

You can install a Kodi v18 test build for now.
V18.1 will be delivered as a stable update imminently


just get a test build from like onealliance or uk1

Kodi builds are usually just a bundle of add-ons. They don’t affect the core binary version running.