Hey Dexter,
Plan description text is hidden for mobile devices.If you want to show this then do the below mentioned changes.
# Go to
root/components/com_payplans/templates/tmpl_bs3/_media/css/site.css (if you are using bs3 template) or
root/components/com_payplans/templates/default/_media/css/site.css , find below mentioned css near line no. 119
.payplans .pp-plan-description
{
display:none;
}
Remove above code from here.
Let me know if still issue persist.