Hi Lydia!
Sorry to hear that the block layouts in the Post and Page Builder are not displaying properly for you and we will do everything we can to help!
The problem you described can be related to a number of things, and the first thing I would check is to make sure all of your plugins, themes and core files are updated to their latest version. I also suggest making a backup of your website before running any of these updates in the unlikely event that something happens during the update process. That way, you will have something to restore from should any issues occur.
If the updates do not fix the problem, or there are no updates available to run, then the next explanation could be a conflict with another plugin installed on your website. You can check for plugin conflicts by deactivating all non-BoldGrid plugins installed on your website and then review the block layouts in the Add Block interface. If things start working normally again then start reactivating each of the deactivated plugins one by one and checking the block layouts each time to see which plugin is creating the conflict.
I hope that one of those methods gets the block layouts displaying properly on your website and please let us know if there is anything else that we can do to help!