Hi,
Your cron task was not right configured in your server and it was forcing a redirectin to your homepage.
So our system, after several iterations (during several days), have finally save your home page as the cron trigger url.
Since that day, your homepage is called every 15 minutes instead of the cron trigger url.
I fixed it in our server, please be sure that your cron url can be right called otherwise the same trouble will happen.
About your points.
1 - the period is the time between to trigger calls for the plugins. This value is in seconds.
2 - the strange value is a timestamp ; it indicate the time when you have been trigger for the last time.
3 - if you see that you are no more called for the cron task ; please check that the url is working and click on the button "create/edit your cron task" to update the url in our server.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.