the MX25 sets the time on msp430 by calling void set_time(u32 time) which writes the_time variable. The same variable is read-modified-written by the interrupt routine TIMER_ISR called every second.

The fix is to replace:
void set_time(u32 time)
{
	the_time = time;
}

with:
void set_time(u32 time)
{
	while (the_time != time) the_time = time;
}