Can anyone offer some insight as to why the second layer after the base layer seems to contract, having a smaller perimeter than the rest of the layers above it? I’ve noticed this happening lately, I don’t remember this being an issue prior. The bottom layer is adhering to the bed, there’s no curling or lack of cooling. I don’t know how to fix it. 
It seems to be an effect due to transitions from and to layers having infill and most visible with thin walls.
My assumption is that the infill overlaps the perimeter a little and pushes the wall outwards or prevents it contracting inwards.
Sparse fill or hollow areas permit more freedom of movement for shrinkage and this shows on the surface.
I am not a materials expert and willing to be corrected.
intresting 
can you post picture from below? so that we see if your first larer isn’t too low/high?
long shot, first layer to high. skirt line looks like just layed on bed, it should be little pressed to bed.
heated bed is to hot.
I’ve struggled with the same issue for a long, long while as well, going as far as the first and second layer completely peeling off after a print. What it ended up being was that my heated bed (cheap PCB heater + glass back then) would bow upwards as it heated and relax or even bow downwards when the temperature dropped for the second layer. Grab a dial indicator and see if you get significant swings when your bed heats and cools.
The further from the heated bed=the greater the shrinkage when temperature is lost. I hope this helpful, but I am honestly drunk.
I print with a constant temperature on both bed and hit-end. A few of you have said it could be the temp of the heated bed, I’ll try lowering that. The images I supplied, I was printing PLA with a 65deg bed. My hot-end is at 215 which has always given me good results. I use an 8:1 mix ratio of PVC glue and water which I find is amazing for adhesion.
I’ll do some checking of warpage as @Thomas_Sanladerer mentioned. I’m on a machined aluminum bed with glass on top. I’ve gone over my build surface with a straight-edge and haven’t noticed any extreme variations.
@Kristijan_kolak I’ll try smoothing the first layer a little more, I’ll post some pictures of the first layer print. I use a .127mm feeler gauge as my height adjustment, I thought it was a good height, maybe it’s too high.
This is definately a result of higher than needed first layer height.
I’ve since adjusted the first layer height on a new print. I’ll take a look when it’s done. From first observations, it doesn’t look like it made a difference.
…Or at least a significant difference. I’m not home so I can’t say right now, I’m just watching through octopi.