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There are several possible reasons why the program may not be returning to the main program. Here are some common issues that can cause this problem and their possible solutions:

1. Not restoring the stack pointer: If the program uses the stack pointer (SP) to push and pop values, it must restore the SP to its original value before returning to the main program. This can be done with the TSX and TXS instructions. Make sure the program is restoring the SP correctly.

2. Not restoring the interrupt flag: If the program uses interrupts, it must restore the interrupt flag (I) to its original value before returning to the main program. This can be done with the CLI and SEI instructions. Make sure the program is restoring the interrupt flag correctly.

3. Not correctly exiting the program: If the program is exiting abruptly without returning to the main program, it may be because of an error in the program logic. Check the program flow to ensure that all code paths eventually lead back to the main program.

4. Not releasing resources: If the program is loading resources such as memory or devices, it must release these resources before returning to the main program. Make sure the program is releasing all resources correctly.

5. Crashing the system: If the program is causing a system crash or error, it may not be able to return to the main program. Check for errors in the program code or system configuration that may be causing the crash.

By identifying and addressing these issues, you can increase the likelihood that the program will successfully return to the main program.