More than likely moved when trying to run it.
I use independant cam pairs as well , reason being the use of heat treated drill rod. Long cams tend to bend when heat treated. Tried many suggested methods without success, basically waste of time and effort.
Method I use here is to assemble cam pair blanks on 3/16 steel rod, then drill and pin each with 1/16 roll pin. Lock shed doors,mark and grind all the cams in correct sequence, disassemble and heat treat cam pairs, polish and refit with roll pins.
You could of course use a metal type like 4140 that does not require heat treatment, except here in Aus 40mm dia is about the smallest anyone stocks.
Would not trust the loctite method ever.