I'm creating a registration system using wordpress, meta box and custom table plugin.
First method, I was creating registration post as a custom model. Input worked fine. But when on client's trial using 5-6 persons with different devices and saving in the same time, only 2-3 data saved and others are gone even no error message received.
Second method, I changed from a custom model into regular custom post type and put all post metas into custom table. Same trial tested, and the same thing happened. But only for this method, all posts are successfully created, and only 2-3 data saved in custom table (for post metas).
Third method, I'm using standard custom post type with post metas save in standard wordpress table (xx_postmeta). Same trial tested, and all the post and post metas are successfully saved.
Please advice why custom table are failing on the above tests?