i have the same issue... using the following mods:
GWX
Type VII Open Hatch
GWX Late war Sensors
16 km visibility
Tikigod's engine orders telegraph mod
Steed's type VII Black white grey skin
it only occurs when i am diving, the steeper the dive, the harder the list. On the compartment views the boat lists to starboard when diving and evens back out to level when at a constant depth. in most cases it is barely noticable but when making large depth changes or crash diving it is very noticable.
rause is correct, when facing directly to port or starboard it looks like the sub is angled down correctly, but whin facing ahead there is a list to one side - most often for me it is to starboard, not port.
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