I have been developing some film this AM with Hurricane Isabele effects blowing outside.

The TRI-X 4x5 sheet film stained very nicely, developed in HP Combi tanks.

However, the Ilford PanF Plus 120 did not stain even half as much. Also the 35mm PanF Plus did not stain at all. Both rolls were developed together in tanks, agitated 2 inversions ever 15 seconds, with 2 minutes in the used developer, agitated ever 30 secs.

Why the difference in stain, especially the 35mm?