I found the cause of this problem and was able to reproduce this issue.
If you have a section break, and set an “If Any of the following match” conditional logic, the entries with this section won’t be able to be updated. But the entries above it, is able to be updated.
For instance, say I have field 1, field 2, section break, field 3, field 4. and set conditional logic to the section break, if any of field 1 or field 2 fullfil the condition, the section that includes field 3 and field 4 will show up.
When editing the entry in single view, I can make changes to field 1 and field 2, and it updates when saved, but any changes made to field 3 or field 4 won’t updated when saved.