Epoch values for date range are incorrect

Here’s the schema: Mockaroo - Random Data Generator and API Mocking Tool | JSON / CSV / SQL / Excel

Here’s the first 10 results from one example that I just generated:

{
  "id": 1,
  "epochstamp": "1508140408"
}, {
  "id": 2,
  "epochstamp": "1391107722"
}, {
  "id": 3,
  "epochstamp": "1347733185"
}, {
  "id": 4,
  "epochstamp": "1501503693"
}, {
  "id": 5,
  "epochstamp": "1597379818"
}, {
  "id": 6,
  "epochstamp": "1427354655"
}, {
  "id": 7,
  "epochstamp": "1530807790"
}, {
  "id": 8,
  "epochstamp": "1592066548"
}, {
  "id": 9,
  "epochstamp": "1472903208"
}, {
  "id": 10,
  "epochstamp": "1413315439"
}

Here’s a link to a full 1000 row download

As you can see the entire set comprises a few days in mid-January 1970 rather than a random assortment across the specified range (1 Jan 2010 to 31 Dec 2020.)