I'll try:
made some screenshoots hope its easyer to understand:
Sart here
Chkick suche
inserd red text
Results
Go to site 2
you get
Go back to results
chlick site 1
scroll down a little an klick Konzertgeschichte (link to site 2)
you get
I checkt the rights that seems to be ok.
question is why ist site 2 called from search results "empty" but called from site 2 with all results?