Once you logged in all your local chrome settings and data will again sync to the server.
Restart chrome and again goto chrome://settings/syncSetup and Select "Choose What to Sync" and then checked "Extension" option, your local chrome extension will sysnc to server except "Sumo Paint".
Best Answer
First remove the sumo paint extension from chrome,
then goto chrome://settings/syncSetup and Select "Choose What to Sync" and then unchecked "Extension" option
then goto https://www.google.com/settings/chrome/sync and "Reset Sync" button. It will clear all your data from server, after complete it will ask for login.
Once you logged in all your local chrome settings and data will again sync to the server.
Restart chrome and again goto chrome://settings/syncSetup and Select "Choose What to Sync" and then checked "Extension" option, your local chrome extension will sysnc to server except "Sumo Paint".