Separate Images linking to same place

This is the second time i’m trying this, i got so fed up the first time i reinstalled and started agin, now i have the same problem.

I added 5 images (125×125) and linked them to 5 different places. 1, 2, & 3 work 100% but the 4th go to the 5th and if i amend then the 5th goes to the 4th – so whichever way i amend, the last 2 go to the same place when clicked.

I plan to add 150 drum lesson images and link to 150 youtube videos set to private and offer membership to the site BUT i’d need all 150 to work separately but i can’t seem to get it right?

Is this something that should be an easy fix?

Any help appreciated