I'm using CorelDraw - currently 2018 in Windows 10 64bit, but I've been struggling to get Internet links to behave for a long time now.
I'm just going to publish some simple steps to reproduce some issues here for convenience and discussion, then I'll raise a support ticket...
This causes me a massive headache when I'm working on any leaflet with around 10 links or more.
I'd be interested to know if anybody else is being frustrated by this or has found a way around it.
Just in case anybody finds this post having experienced the same issues, here's a quick update...
Corel support were able to reproduce this issue and so there's a ticket somewhere in their bug tracking system.
Interestingly, they were only able to reproduce the issue when using copying/duplication, which I routinely used to quickly create the boxes: draw one, copy right a couple of times, select all, copy down a few times. So, the working theory is that it's possible for Internet links on duplicated items to become confused. If that holds true, then a likely workaround is to ensure you draw a new object whenever you need to apply an Internet link.
Corel inconsistently and randomly mixes link assignments without regard to how they are added when the file is output to a PDF. This has gone in versions at least back to X3 and the problem persists in Corel2018. I have no faith that it will ever be fixed. The workaround is to output a PDF with no links and then use an external PDF editing program to add them.