you can open your "tool change" macro with notepad and look to see if there is an M5 command to turn "spindle off" early in the file. if it is not in there, maybe your macro got corrupted somehow, and hopefully you can reload it from a saved copy. if it is in there, then the spindle is not getting the signal to stop - possibly the circuit for that "output" is not responding. you may be able to find your output file, and the respective output number for the Spindle, then look on the output board to see if that output (led) is responding or not.
after you initialize the cnc, you can probably enter M4 in the command line to turn the spindle on, and M5 to turn it off - manually. or you may have a touch button to do the same. yeah, it looks like you have a CW, CCW, and OFF button on your control screen. if it is working there, then the tool change macro probably got corrupted.
make sure that you have selected a "tool change" post processor...