I can not reproduce this. I have try a diffrent combinations – including the build in search dialog and a cusyom form and the result is ok. I'm not sure, but could you please try the latest version in GitHub.
The only way to see what is happen is a link to the problem.
Thank you very much for the exmples and investigations.
Also for the first issue – yes I see there is problem, but the purpose of scroll :1 is to have first scrollbar. I'm not sure that this can be fixed easy, rathrer this should be a developer decision.
For the second issue – try to set scrollOffset to 30/40 and see if this will fix the problem
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