if the Google Calendar app on your phone shows everything correctly, then the easiest solution is to sync CalenGoo in the same way as the Google Calendar app, i.e. via the Android account. Just open "Settings > Accounts" in CalenGoo, turn "Android" on and your Google account off.
However, if you want to sync directly with Google Calendar you should first check if your new events are correctly synced. When you create a new event in CalenGoo it has a small cloud status icon until it has been uploaded. Additionally you can open "Settings > Information > Changes to upload" to see if any events were not uploaded yet.
If your events are uploaded but don't appear on
http://calendar.google.com then you are probably using a different Google account in CalenGoo. On
http://calendar.google.com you can see the used account by clicking on the colored circle in the upper right corner. In CalenGoo you can see the used account unter "Settings > Accounts".
However, if you have signed in again to your account in CalenGoo and then changed the email address, it might not be connected to the account that is displayed there. In that case you can remove and re-add your Google account under "Settings > Accounts" in CalenGoo to ensure that you are syncing with the correct account. Before removing your Google account I would recommend making a backup under "Settings > Backups > Automatic backups" in CalenGoo.