From Discord:

New wallets are ready (version 1.2), please update your wallets with the new version to make sure you are on the right chain
Windows wallet : https://github.com/CMOS-Project/Cosmos/releases/download/v1.2.0/cmos-1.2.0-win64-setup-unsigned.exe
Linux wallet: https://github.com/CMOS-Project/Cosmos/releases/download/v1.2.0/cmos-1.2.0-x86_64-linux-gnu.tar.gz
for other operating systems please visit here: https://github.com/CMOS-Project/Cosmos/releases/tag/v1.2.0