Bridge_overlap stuck to 77.8%

[A13xund3r]

I've just downloaded 2.5.60.0 for windows and can't change Bridge lines density max, it resets to 77.8% all the time. When I change Bridge lines density min it is accepted but reset to 77.8% if I try to change max. I'm lost why this happens, is it a bug or I missed something?

[macchinette]

Check these parameters.

[A13xund3r]

I have both the same. Unticked no thick bridge and now I can change Bridge lines density max but it doesn't make sense. At least to me, both settings does have (or should have) different effect and not be related to each other.
Thank you for pointing in right direction macchinette.

[supermerill]

The 'simulate' button is a shortcut to define others so you can have the desired result.
I agree that it's possible to improve the interface, to explain the behavior.