Automation Quotas

[Belinda Bendon]

We have a free Trello account and we have 7 automations to run daily.  The automation is: every day, sort the list "Sent to Client, invoiced & filed" by name ascending

If there are only these automations enabled 7 times, then why by 3 days into the month we have exceeded our 250 run quota?? I really don't understand, especially as 2 of these 3 days were a weekend where no one has been in Trello. 

These 7 automations are across 2 boards - 6 on 1 board and 1 on another.

How are these automations counted?