Since the norm on forums these days is to judge and then lecture you about what you're doing wrong rather than actually help you out, I'm going to actually help you out.
The yellow/orange greens are normal. There are a few methods around this.
You can implement a 3x3 matrix via the RGB mixer or DCTL to re-align the primaries to compensate for the shifts the LUT introduces. This is tricky if you don't know what you are doing. If you're working with Alexa footage they actually supply a film matrix to get AWG into a colour space closer to a film negative, which conveniently also compensates for the shift. Bottom of page 7 in this document shows the matrix required: http://www.centron.sk/Storage/Document/Product/3453-2012-08-02_Alexa_LogC_Curve-Usage_in_VFX.pdf
Or as a DCTL, last post on this thread: https://forum.blackmagicdesign.com/viewtopic.php?t=61073&p=348495
Or even as a LUT via the Arri LUT generator: http://www.arri.com/camera/alexa/tools/lut_generator/lut_generator/
A simpler method is to just use a hue vs hue curve prior to the LUT to shift the yellow greens back to actual green. If it looks right it is right.
The method I use is to set a node to YUV mode then use the RGB mixer with Preserve Luminance set to off, to interactively place the greens where I want them. First time you do this, use a colour chart and try to match the look of greens under an FPE to the look of greens from the cam manufacturers LUT. Find my Brim LUT rebuild tutorial on youtube to get an idea how thats done.