SCT CTLR EXPRESSED CONCERN REGARDING GHOST TARGETS OBSERVED WHILE WORKING THE EAST FEEDER POSITION.

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I WAS WORKING THE E FEEDER RADAR POS. THIS POS HANDLES LAX ARRS FROM THE E OF LAX. I OBSERVED 4 GHOST TARGETS IN ABOUT 6 MINS. THESE WERE RPTED TO MY SUPVR AND I WAS TOLD THAT THIS WAS ENTERED INTO THE FACILITY LOG. WE HAVE BEEN EXPERIENCING THIS FOR OVER 1 YR NOW. XA28 I OBSERVED A DATA TAG WITH ASSOCIATED MODE C ALT OF 16000 FT ABOUT 10 MI N OF CIVET INTXN. THE TARGET APPEARED TO BE A GOOD TARGET AND EVEN UPDATED A FEW TIMES BEFORE COASTING OUT. XA34 I OBSERVED 2 TARGETS APPROX 10 MI S OF PDZ VOR. BOTH TARGETS HAD A MODE C ALT AND BOTH HAD A BEACON RETURN. ONE WAS A BEACON CODE OF XXXX AND DISPLAYED AN ALT OF 15000 FT. I LATER DISCOVERED THAT THIS WAS A GHOST FROM ACR X THAT WAS ABOUT 25 MI TO THE E. XA34 THE SECOND TARGET WAS ABOUT THE SAME LOCATION AND HAD THE SAME CHARACTERISTICS BUT A DIFFERENT CODE AND ALT OF 14000 FT. I STARTED A LCL ARTS DATA TAG ON BOTH ACFT SO THEY COULD LATER BE TRACKED. XA40 THE LAST ONE WAS AN LAX ARR THAT SHOWED ON MY SCOPE ABOUT 20 MI AHEAD OF WHERE IT ACTUALLY WAS. EVERYTHING LIKE AN ACTUAL REAL AIRPLANE -- BEACON; MODE C; POS UPDATES; ETC. THE SUPVR NOTIFIED MAINT AND HE SAID SOMETHING ABOUT RESETTING THE BUFFERS. THIS SEEMED TO MAKE THE PROB GO AWAY; BUT I TRULY BELIEVE THAT IT WILL HAPPEN AGAIN. SUCH DISTRS DEFINITELY DEGRADE SAFETY!