Automatic vectorisation of my links in my pdf

Hello

As a DTP operator in a print factory, I saw that sometimes I found my links vectorised automatically in some pdf. When I quit and back again, the links are okays. I precise that my links are pdf too.

Also, when it happens, I see that random object of my document are bounded with those vectorised links.

I do not know why, but I hope I could help.

Thanks

Julien