Nothing wrong there.

There are two different actions that can change the way INT_ENABLE works with version 1.10.

DEFINE INT_ENABLECLEARFIRST 1 ; (default)
With the above define, which is also the default, whenever you INT_ENABLE, the flag is automatically cleared before the interrupt is enabled.

DEFINE INT_ENABLECLEARFIRST 0
Whith this define, the flag is NOT cleared.
This can dramatically change the results and cause immediate interrupts if the flag is already set.

If INT_ENABLECLEARFIRST is 0, then INT_ENABLE takes one instruction cycle.
If INT_ENABLECLEARFIRST is 1, then INT_ENABLE takes two instruction cycles.

INT_DISABLE always takes one instruction.