Free plan compute hours exceeded

Hi, I am on the free plan and got an email saying that I have exceeded 50 compute hours included in the free plan.

The way I understand calculation of compute hours works is:
  1. if I CU is used for 1 hour, then 1 compute hour is used
  2. if 0.25CU is used for 4 hours, then 1 compute hour is used
background:
  1. My app is still in development and has literally no traffic, I have been monitoring CU usage and aside from some short-bursts, I have never seen it exceed 0.25CU
  2. As such, I also know that db usage has not been 200 hours (including idle time before auto-suspension) in 9 days of this month
  3. On the production branch, autoscaling is on - from .25 to 2CU
question:
So, I am having a hard time understanding how 50 compute hours got exhausted in such short amount of time. could someone pls help? Please let me know if any other details are required.
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