It is. Timers trigger in the order that the Windows API decides they do. The -h switch (highres) makes Windows API think more carefully about order, which matters when the timers are all triggered within the same millisecond (usually the case for a while loop).
In short, it's out of mIRC's hands (mIRC is likely even issuing the timer commands in the correct order). If you care about timer order, you want a highres timer.
