Hi,
the time range filters in PlanetScope subscriptions apply to the “published” time, not to the “acquired”/sensing time. For example, if you make a search for a single date of 2018-01-01, only the product ‘20180101_073826_102e’ is returned; its sensing time is 2018-01-01T07:38:26.322995Z but the published time is 2021-02-19T22:38:24Z, so it is not captured by your subscription. This is documented here.
Fortunately, you can expand the time range of your subscriptions to the present date at no extra cost. Later on you will still be able to filter the data by the actual sensing time using Process API or similar.