That is strange, and is exactly what I have been doing here (WD v10.37S53).
With ‘Show scrolling marque of all time records’ unchecked I get the following html output snippet
<B><center><marquee style="font-family: Arial; font-size: 10pt; color: #3333FF" behavior="wrap" width="800" height="25" scrollamount="4">Forecast: mostly cloudy and cooler, precipitation possible within 12 hours, possibly heavy at times, windy.</marquee></center></B>
With it checked I get this:
<B><center><marquee style="font-family: Arial; font-size: 10pt; color: #3333FF" behavior="wrap" width="800" height="25" scrollamount="4">
Record high temperature 32.7°C Record low temperature -7.4°C Record high gust 50.6 mph Record high average 38.0 mph Record daily rain 53.6 mm Record low windchill -9.7°C Record high barometer 1042.9 hPa Record low barometer 964.2 hPa</marquee></center></B>
<B><center><marquee style="font-family: Arial; font-size: 10pt; color: #3333FF" behavior="wrap" width="800" height="25" scrollamount="4">
Daily high pressure 1009.7 mb Daily low pressure 1000.8 mb Daily low windchill 13.6°C Daily high heat index 21.6°C Daily high gust speed 0.0 mph WNW Daily high average speed 0.0 mph NNE</marquee></center></B>
<B><center><marquee style="font-family: Arial; font-size: 10pt; color: #3333FF" behavior="wrap" width="800" height="25" scrollamount="4">Forecast: mostly cloudy and cooler, precipitation possible within 12 hours, possibly heavy at times, windy.</marquee></center></B>
i.e. additional elements for the all time records which makes sense with the checkbox function description, is there something else? :?