As far as I know the weird rooms with lots of lava, water, sinks, toilets, iron bars are a feature. A quite nice one. What I see on the screenshot is map-refresh disable activated - a negative effect (usually timed).
SLASH'EM Extended uses trap effects to damage user interface, as if NetHack's interface was not tricky enough to master. In my opinion this adds a little difficulty while taking away a lot of fun.