Your Callout Rate is based on how many past confirmed shifts you call out of which do not have a valid excuse/are unexcused.
For example, if you have been confirmed for 100 shifts and you have 5 unexcused callouts, then your Callout Rate would be 5%.
If your Callout Rate is higher than 15% you will be allowed to apply to only 3 shifts at a time. If you want to apply to another shift you will need to first withdraw from an applied shift. Once your Callout Rate is below 15%, you will once again be able to apply to more shifts.
To learn more about the callout policy, please read 'What is ESHYFT's callout policy?'