Vinyl "bleed through"- need set-up advice

I read this forum regularly and am amazed at the knowledge that is shared. I need your opinion/help. I have recently got back into vinyl with a Rega P9/Dynavector XX2. The issue is : I can hear what is coming up next on the record faintly a splt second before it actually plays- it kind of "bleeds through". At louder volumes it really is quite clear and annoying. I had the cartridge installed by my dealer with whom I have had a very long relationship- did he miss something? Any/all help is greatly appreciated.I use Naim amps if that helps.Thanks!