Latency when loading lua script into labjack using python

Hello!

I'm using a lua scrip that provide two signals: sine wave on DAC and digital output on FIO. the digital output is used to be high on the peaks of the sine wave.

My problem is, when i launch the lua script directly from Kipling, the digital output is very precise (high exactly on sine wave peaks). But when i load the lua script into the Labjack from a python file using the function load_lua_script, their is a phase shift between the sine wave peaks and the peaks of the digital output.

Have you any explication about this problem and if their is solution to this issue?

Thank you,