It might be possible that the Stackable blocks are disabled on your site, that’s why you are unable to see the Stackable blocks. You can check the Stackable menu if the blocks are disabled. If you’ve disabled a block, you won’t be able to add the disabled block.
http://bit.ly/38pzt6N
Please also check your Block Manager and make sure that Stackable is turned on.
http://bit.ly/2NNm3K1
You can see this on your page then click the Three Dots beside the settings.
http://bit.ly/3aqMWwZ
If this still doesn’t work, if you still can’t see the Stackable blocks, we can investigate this further. Would it possible for you to give us admin login details with access to the block editor and plugins? We assure you that the details you’ll provide us will be safe with us and will only be used for the investigation. You can email us directly at support@wpstackable.com
Resolving this, please re-open if needed. 😊