Dave is correct. If the pre-echo is exactly one revolution of the LP before the same music starts, it is a phenomenon of the grooves. When the pressing is made, the 'next door' groove with affect the one next to it. How or why I havent a clue. (It seems crazy impossible? to me, but that is what it is.)
The other possible reason (if the pre-echo is NOT exactly one Lp revolution before, is that the master tape had the pre-echo in it. From print-through of the tape signal.
And yes, it does mean your system is very resolving, and your cart is spot on.