For clarification, here is the configuration:
a) I configured it as CAT2, but when I tried with CAT1 it gives the same behavior
b) I have no such configuration parameter in Autosar Os plugin.
c) Yes, I'm clearing the interrupt flag once I enter the ISR
but the interrupt flag register originally doesn't show that there is an event and here is the issue, how I'm getting this ISR while there is no interrupt event detected
d) Actually I tried it using the oscilloscope, the ISR came before the interrupt pulse has occurred
Final Note:
even if I removed the pin configuration from the Port plugin and didn't initialize the corresponding registers, still got the ISR
which means in my opinion may be there is an issue with this ISR configuration or something like that.