There is one type of open, but 2 different types of clicks. When a campaign is open, it means people can click on links afterwards.
Click on sent is the amount of people that click on the total amount of sent.
Click on open is the total amount of click on the total amount of open.
A campaign was sent to 196 contacts.
47 people opened it : the open rate is 24% (47/196)
10 people clicked the in the campaign
click on sent: 10 rate is 5% (10/196)
click on open: 10: rate is 21% (10/47)