Temperature disappears when 0C

We’re using the Card 1 shortcode layout. Last week, we had two strange occurrences for the current temperature that was displayed.

Firstly, one day the number disappeared entirely and we just was “C” in the temperature display. I’m wonder if this is because it was exactly 0 degrees and perhaps the number was being treated as false (or similar) and not getting converted to a string for display?

Another time that week, it displayed -0C which is grammatically incorrect. It should just be 0C with no negative sign. Presumably this has been caused by rounding.

Thanks!