Steps to reproduce:

Open a spreadsheet on http://sheets.google.com/ (blank is fine)
Ensure accessibility and Braille support are enabled.
Navigate around the sheet with the arrow keys.

Actual behavior:

NVDA reads "Contents, selected, cell address" for each cell (where contents is the text in the cell and cell address is A2 or C12 or whatever the address is).

Expected behavior:

NVDA should only report "selected" when multiple cells are selected.

System configuration:

Firefox 62.0 64-bit or Chrome Version 69.0.3497.100 (Official Build) (64-bit)
(Behaviour the same on both).

NVDA Installed/portable/running from source:

NVDA 2018.3 installed.

Windows version:

Windows 10 fast Insidier build 17763.1

Does the issue still occur after restarting your PC?

Yes

Have you tried any other versions of NVDA?

NVDA 2018.2.1 (portable)
NVDA alpha-16065,4eb7aa5b (portable)