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What platform are you running Path of Building on?
Windows
What is the behaviour in-game?
The flask mods which provide immunity to Bleeding, Poison, Shock, Freeze and Chill and Ignite, that are native to utility flasks would gradually reduce the number for the "Less duration" part. It's equally gradual in between the tiers as well as in the same tier of the mod.
What is the behaviour in Path of Building?
The aforementioned flask modifiers do not scale properly on the tooltip description of the seeker when you customize a flask. Although, they would eventually scale properly on the flask itself. (see the screenshot).
I suspect that this may come from the fact that the less "Less duration" is practically counted as "More duration".
But there is still the visual difference between the two tooltips while using the seeker to adjust the value.
How to reproduce the issue
- Click to create any magic utility flask.
- Customize it by adding one of the modifiers mentioned above.
- Move the seeker a little and observe both tooltips.
Character build code
Screenshots
In PoB:

Check version
Check for duplicates
Check for support
What platform are you running Path of Building on?
Windows
What is the behaviour in-game?
The flask mods which provide immunity to Bleeding, Poison, Shock, Freeze and Chill and Ignite, that are native to utility flasks would gradually reduce the number for the "Less duration" part. It's equally gradual in between the tiers as well as in the same tier of the mod.
What is the behaviour in Path of Building?
The aforementioned flask modifiers do not scale properly on the tooltip description of the seeker when you customize a flask. Although, they would eventually scale properly on the flask itself. (see the screenshot).
I suspect that this may come from the fact that the less "Less duration" is practically counted as "More duration".
But there is still the visual difference between the two tooltips while using the seeker to adjust the value.
How to reproduce the issue
Character build code
Screenshots
In PoB:
