v-core 4 dragging nozzle through print

I've built a ratrig v-core 4 IDEX and have mostly completed the commissioning guide. Mostly, the printer appears to be working. Problems arise however, when I start printing.

The first layer goes down a treat and the second one looks OK too. But after that, the printer appears to be dragging the nozzle through the print. I can see the lower layers compress as the nozzle is laying down the next one. After stopping the print, I can see nozzle shaped indents all over the last layer.

I figured maybe something is wrong with a Z axis multiplier of some sort. But when moving the build plate 100mm up or down and measuring with a ruler, the movement distance appears correct.

Any ideas what's going wrong or what I could try to debug this?
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