2.13.38

functional improvement

EC Purchase History
1. The date of the receipt has been changed from the date of issue to the date of payment.

Bug Fixes

Progress record
1. Fixed a problem in which only the bottom row remained when clicking "Undeliverable Only" with the folded part of the material passed in the study progress opened, so that only the undeliverable part is correctly displayed.
Check socres
1. Fixed a bug in which explanations for incorrect answers were not shown, so they are now shown.