Are you importing the clip from Google Drive directly into LumaFusion? If you have imported to the Photos App, then it may auto convert it to 30p.
If you are coming straight into LumaFusion from Google Drive then it could be possible the clip is 60i (interlaced) rather than 60p (progressive) which would account for the timing to be 30p. Also, you may want to download the clip from Google Drive to your desktop and make sure no other application has converted it.
Could you send us a short clip to email@example.com
so we can take a look?