Looks like the nozzle is too close (z-offset is wrong) or too much filament is extruded (flow rate is too high).

I've been out of using 3d printers for about 2 years due to building a house, so I've forgotten all the terminologies used. Anyways when I had this issue on my ender 3 it was because I was using too much filament and the edges of each line was merging in to the next then pushing upwards slightly.

I had to really tinker with my first layer. What I had to do was make the initial layer a bit taller but also use slightly less filament. Sorry I can't go more in-depth with the terminologies.
It worked though, I even got great first layers when using petg and wood based filament.

Any chance the filament is unevenly extruded from the manufacturer? Try measure the spool in few places with some calipers to verify that the filament thickness is exactly 1.75mm, and that it doesn't vary.

Also, might be worth it to check your flow rate/extrusion multiplier setting to ensure that the amount of plastic extruded matches what it is trying to do.

It looks to me like the nozzle is too close to the bed. This seems to be a common issue with a couple of possible causes. Have you checked if the four screws that hold the hotend to the linear rail are screwed in correctly?