It's not the bug, but

[sergeA (SERGE)]

IMHO, it’s necessary to warn the user (via dialog window) that after applying any user preset(s) (not predefined!) to an image, all previous horizon tool adjustment(s) are discarded automatically.

[Pieloe (Pascal)]

… YES but only for a complete preset.
Be careful with concept of partial and complete preset

http://dxo.tuto.free.fr/Efficacite/Efficiency.html#B2_Lautoreglage_de_depart

Pascal

[sgospodarenko (Svetlana G.)]

Hello @sergeA,

MHO, it’s necessary to warn the user (via dialog window) that after applying any user preset(s) (not predefined!) to an image, all previous horizon tool adjustment(s) are discarded automatically.

Pascal is right, it depends on what preset you apply Complete or Partial.

Regards,
Svetlana G.