Mh 1351 do not cut end exactly

[Mh 1351 do not cut end exactly]

I work with a MH1351 cutting plotter, but the start and end points of the cut won't be connected.

Please could you help me?

[Mh 1351 do not make cuts accurate to size]

Good day.
I work with a MH1351 cutting plotter, I installed the software FlexiSTARTER, configured as a manual to 9600 bits per second USB cable. 
I have one problem do not make cuts accurate to size. I am sending to cut from FlexiSTARTER a 75,5 cm but it cuts a 76,5 cm. Idem with all designs.
I have reviewed all the shipping parameters of cut and all are at 100%. Is there a hidden parameter that I'm not seeing?

Could someone please help me?

Thanks