Annoying problem making contact

[NeonsStyle]

Hi,

Recently, I've been having a really annoying problem.
I'm using TDW's UI's mod... and everytime I find a contact
on hydro, I try to do an end run on it outside 8000m from
target, as soon as I pass them, and start to close in on my
attack position, they turn around and go the other way.

Now they can't have seen me, as they are over 8000m away
(and in TDW TDC UI - that's the min dist for ship to spot sub).
These are warships, destroyers... they are defending a spot SW
of england at entry to liverpool harbour areas, and I want to
eliminate them. They do not know I'm there, as they don't
try to attack... they are just on patrol.

Any ideas anyone as to what's causing this?

Another annoyance, is I have setup to attack a convoy
that is closing on my position. I then save it, and close the
game. Next time I come back... the convoy and all my marks
have disappeared. Anyone know why? Here's the list of mods installed.

Church's SHV 1.01 Keyboard Commands v1.1
Danevangs Paint Shop 1.0 Type VIIC Pack
Depth_Keeping_Problem_UHS_patch_HB_1_0_0_TheDarkWr aith
Enhanced Ship Recon Manual V1.02
Goodbye Pacman
MoraleMod
North Atlantic Green 1.1
Old Style Explosions V1.1
Realistic ammo amount for AA and deck guns
Reboot's Hot Soup
Shadow Improvement Mod
sobers base wave mechanics for SH5 V12
sobers realistic hydrophone operator SH5
Zoomable Camera mod
A Fistful of Emblems v1.51 (Weathered)
Black_Skin_albrecht
Nauticalwolf's_Torpedo_Textures_v1.2
Icebergs v2.4
upgrade cost 0 renow points by stoianm_v1
Magnum_Opus_0_0_1
NewUIs_TDC_6_3_7_ByTheDarkWraith
Trevally Automated Scripts v0.5
Battlestations_soundmod_1.1
Player Guidance Icons Removed v1.0
No Logo Intro Menu_Animation v. 01.00 by AvM
SteelViking's Interior Mod V1.2
Manos Scopes-SH5 (for TDW's Gui)
SubFlags_0_0_6_byTheDarkWraith