3DPrinting
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Do you have a single MGN rail on X or two? It's easy to end up with twist on dual X rails that can be a bugger to try to straighten out.
Also, are you doing a good heat soak before printing, and do your probe results change at all before and after heat soaks?
If you've got a beacon on there, it seems like it would be well worth cranking the probe points way up.
If it's simply bed adhesion, definitely give the dish soap method a try if you haven't already.
cranked up the mesh points and switched from lagrange mesh to bicubic. here we are at 35x25 points. weird, I see spikes.
Oh and to answer your question, there is one linear rail on the X axis.
It looked like you have a textured sheet? 0.2 mm variation over the entire built area isn't huge, might be exaggerating it.
How much of a heat soak? If you're going to the edge, let that sit for at least an hour, preferably more, look at Ellis' page on thermal expansion, frame will absolutely expand. I use backers on my 2.4, gantry is giant bimetallic strip, backers do seem to help with that. Klipper does have the ability to correct for this as well, in that link. I do also have a kinematic bed mount (it's coupled loosely to the frame, basically gives the bed room to expand), which again does seem to help, but I'd personally say heat soak is the first thing to do to achieve consistency.
And to echo others, degrease your bed with dish soap & water (unless your surface can be damaged, Buildtak that's a no, don't of that for example). If that's a textured sheet, may need to give a bit more of a squish, but get it good and clean first. Ellis has some solid 1st layer calibration and troubleshooting guides to go through. For pei, personally I've found I needed to rough up the surface a bit with a brass brush, I don't love pei on my voron, usually use buildtak but have had really good results with the fire resistant version of garolite.
Edit: read up on your probe, eddy current based? Sounds really interesting, my first point is probably moot, though possible you could be picking up the texture or if you have strong magnets it could affect it (my bed has an array of strong round magnets, seen others that are just a magnetic sheet), the do call that out in their FAQ.
I notice my open air bambu labs p1p doest have any problems like this and it doesnt need a heat soak. Isnt the voron a better machine with higher quality parts?