I have encountered Strange Blotchy Marks along one edge of My 120 Negs.
Not happening on all of my films though.
Developer is Rodinal 1 to 50,
Paterson Tank 500ml of Chemistry.
30 inversions for first minute, 3 every minute thereafter.
Water for Stop Bath.
Fix 6 min's in Hypam.
Wash and Dry as Normal.
Film is HP5 and FP4.
Have processed Hundred's of Film's this one has me slightly puzzled.
Could I be over Agitating ???

Any Help Appreciated.
Camera is Pentax 67.