
The bug only happens for products which don't fit on the first page of the above displayed menu (in other words: you have to scroll down to reach them). When you change the position of the slider of one of these products than the game automatically scrolls back to the top and also applies the change to the product which now has the position of the product you originally wanted to change.
I'm using version 3.5.16 with the Subsidiary DLC and no mods. In the attachment you find a save-game for easy reproduction (had to zip it because the forum doesn't allow .sav uploads).
Steps for easy reproduction with the attached save-game:
- In the main menu: Screen mode -> Windowed Mode -> 1024x768 (this means only that less products are needed to fill the screen; the bug happens under any screen mode but more products are required)
- Load the attached save-game
- In the information center under Corporate Details: Select Player, then goto products and activate "Show Pricing Policy"
- Scroll down and change the pricing policy of canned soup.
- Notice the described bug