Subscriptions price not displayed correct on All Courses page

Hi, I installed Suscriptio plugin for recurring payments on site. Now after install and setup all seems to work fine but only the products on All Courses page are displayed differently. Some of them has price / per month like should be, another just mention the price without time period of subscription. Why does this happen? https://kwik.rlt.com.sg/all-courses/ Thx!