I have this type of data when I count on the basis of "_Timestamp", I also change timestamp format to date but when I select any one date it count all "_Id"s of 1163 but in that date, there are only 269 "_Id" hits.
This table is the sample, I am uploading my xlsx file and qvf file both.
There many things you need to correct. First as I mentioned correct the link between calendar and main table. Secondly there is error in all your measures. There is no such field like Priority . There is a field called _Priority but it holds the numeric values while in set you have applied the values like 'alarm not open' ..'High'.. etc