First, check that you don't have an import preset that's clearing the GPS data. In the Import window, under Apply During Import on the right side, set Metadata to None and then import some pics:
If that fixes the problem, then you've been using a metadata import preset that's set to clear GPS info.
If that doesn't fix the problem, then upload a sample pic taken directly from the camera (i.e. never imported into LR) to Dropbox or similar and post the sharing link here. We'll verify that it contains GPS info and that LR can import that info.