Had a similar issue with my Ender 3 Pro. In my case, turned out the bed wobbled. A quick Google search said that it’s apparently a pretty common problem with Ender 3 Pro’s. I had to tighten the wheels that held the bed in place, and that completely resolved my problem.

So, my advice would be to check if your bed wobbles

If one corner is tighter that would seem to indicate a heigh spot on ur bed hence the extrusion is being squished into a thinner layer

Do you have any kind of ABL (BLtouch, etc?). If so what does the bed mesh look like.

Edit: I should learn to read better. No ABL.

It may be worth looking at leveling (tramming) your bed.

Basically tighten each of your screws all the way and then loosen them 1 and a half full turns counter clockwise.

Let’s start with your rear left screw. It’s the one with the bed wire retainer and so it doesn’t have as much room to adjust as the others.

In the next steps we’re not going to loosen or tighten this one any more than what we just did. We’re going to use it as the reference/base point for the other 3.

Home the printer and then using the controls on the LCD (or via octoprint/Klipper if you have them) bring your nozzle over the spot where the screw is. Then baby step it down to doing the paper test until you just start to feel the nozzle grab the paper.

Once you have that lift your nozzle up 5mm and move it over the front right screw. Then lower your nozzle 5mm (you can do this in 1mm increments 5 times just to be sure it isn’t likely to crash into the bed. You can tighten the screw if you need room). Once you’re down the 5mm the nozzle will be at the same height as the reference screw.

Do the paper test here and adjust the screw beneath it until it just grabs.

Now do the same for the front left and rear right screws. Each time you’re using your nozzle controlled by the steppers. Which means when it’s moved up by 5 and then down by 5 you’re at the same height.

Once you’ve done all 4 home your printer again and then repeat it. Again starting with the rear left (reference) screw.

We’re doing this because when you tighten and loosen corners the others pivot relatively like a large patch of ice floating on water. Stepping towards one edge raises others. It’s why we’re doing them in opposing diagonal pairs.

(Rear-left and front-right) (Front-left and rear-right)

Once you have all 4 trammed you’ll home again and then check the center of the bed with the paper test. Hopefully it’s the same but these ender beds can curve inward or bulge out a little bit. If so there’s a few ways to fix it but let’s start with the tramming which may solve your issue.