Did you try toggling the "Alert Frequency" and/or "Sensitivity"? perhaps it is too low for your use case?
...Choose alert frequency (how many times)
After enabling the alert, you can choose Low, Medium, or High sensitivity. For example, suppose you wish to get many notifications and always be up to date, even with minor changes. In that case, you can set the sensitivity to high so CoinStats can constantly notify you about the changes.
I haven't seen any alerts history or some sort either.
Side note: Lmk if I did not get the app right lol