SP Page Builder Pro has fatal shortcomings, it seems to have some incompatibility, some pages cannot be opened in the background, and the front end can be viewed normally;

In this case, just because I modified the content and added a Row;
The page seems to have a limit on the number of ROWs, when I want to open the page again, it will display blank

Please note: I copied the website backup and restored it locally, and magically, the problem disappeared. So I think that SP Page Builder Pro has fatal shortcomings, and there are some problems of incompatibility with the server. I am using Bluehost's server.
If you gods have time, please check for me to see if it can be fixed.
If it is a plug-in problem, please tell me first whether to close it. thanks