We do not have any recall limitation via explore plugin by default.
But if the recalls need to be limited we can control that using the option "Stub Recovery Parameters" at the "File System Agent level"
Can you please check if the above option is set and sub-option " Maximum Stub Recovery" option is set to "30".
If this option set, then you can use this to control the increase or decrease of the recall count.
If you do not want any control/limitation just uncheck the option "Stub Recovery Parameters".
Please let us know if you have any questions.