Unwanted drift in my 2d raster scan image

My program will give two analog output signals (one is a triangle output voltage and other is step voltage) to the two physical channels of NI DAQmx Analog Output block. By these two voltage; it will perform a 2D raster scan using a scanning stage. Now; during each scanning point; it will acquire input signal from the detector. And then it will generate a text image by reading voltage at each sample point. Though my program is working, but
there is a drift(shows an incline line rather than a straight line) appears during the scan when I scan a straight line.
I’ve attached you two scattering images; one was a scanning of a straight line. But the scattering image was showing a drift. And other image is single nanoparticle scattering where also you can see the drift in the point spread function (focal spot). I've also attached a screen shot of the block diagram of my program.
I just can't solve this drift.
What I'm doing is to try to recode the same code of an old version (labview 5) into a new version (2010).
I'm not an expert in Labview and need an urgent help regarding this issue.
Software Details: LabVIEW Base Development System version 2010 SP1
NI Hardware: Multifunction DAQ (MIO) device PCIE-6363
Driver Version :
Operating System: Windows 7
Customer Information
Arif Moinuddin Siddiquee
swinburne university of technology
Attachments:
Drift image.jpg ‏29 KB
scattering_784nm_pulsed_vertical_1p4mW_740V_50um_300sample points.jpg ‏70 KB
block diagram.jpg ‏2409 KB

Hi Taylor
Yes, these channels are on the same device.
Can you please suggest me what I should do to start and stop the task at the same time!
I've attached the codes for you.
Thanks
Attachments:
CSOM_arif_ben_peter_dru.vi ‏79 KB
compute_waveform.vi ‏20 KB

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