I have a Settings Page with two tabs. Tab 1 has 21 custom fields each with 7 fieldset fields. Tab 1 displays fine.
Tab 2 should have the same with each custom field having 8 fieldset fields. Everything is fine until I reach custom field 21. At this point the field group reverts from Settings Page / Tab location to Post and I cannot set it back to Setting Page / Tab [name]. Each time I try to set the location it reverts to Post. I also notice custom field 21 only has one of the fieldset fields showing - almost as if it cannot save the remaining 7. If I remove the final custom field then everything shows fine in Tab 2.
Is there a limit of the number of fieldset fields you can have in a single Settings Page tab? Have I reached some kind of database limit?