I pull both DOGE and XRP and they both work fine so im guessing as youve figured out it was something your end
You do need to call all the coins in the same rest sensor and then split them out to seperate sensors though, which can be problematic as you can only sort by market cap or the time they were first listed on nomics.
Sorting by market cap isnt ideal for anyone wanting info from various coins as it can change. So you would think sorting by the time first listed would solve this issue - however nomics only listed a load of coins last year so it falls back to sorting by market cap. Therefore, i do sometimes get my XRP and DOGE coin sensors interchange due to them having similar caps
From the guys at nomics they told me
We started tracking the first price date about a year ago and before that we don't have data, so since you're asking about a bunch of older coins here they actually all have the same start date when we started tracking things. So then they fall back to rank sort.
I dont really understand why they therefore wont allow you to filter by first trade, first candle or first order book as they do store all this info in their API and the info is correct. I did ask if they would add any of these as potential filters but the answer was no