Version:           3.4.1 (using KDE 3.4.1, Debian Package 4:3.4.1-1 (3.1))
Compiler:          gcc version 3.3.6 (Debian 1:3.3.6-5)
OS:                Linux (i686) release 2.6.11.10

The auto-fill form feature shall not fill those elements of the form (inputs mainly) which are currently disabled (even it used to be enabled previously, when the password was entered 1st time and remembered in wallet). The problem is, some sites does expect disabled fields to contain no data and then they check this (or compute something) and won't let you in.
The living example is here: https://www.bph.pl/pi/Login - enter i.e. "1" as "Identyfikator" and click "Dalej". Then you see the password fields, where each letter got own input and some of them, randomly chosen are disabled. Unfortunately, konq fills all these fields he knows about which disallow me to login any more