Can't cut circle - it cuts a squigly squashed star instead

Can’t tell if this is realy the thing that you are seeing because im not running on a live Maslow.
It is a Mega without motor shield or anything attached, so my finding might be off the real world.
I have replicated some weird teleportation of the sled and recorded it. (FW/GC 1.02)
https://youtu.be/GJkYxNHZY-8
At 0:44 a buffer overflow hapens. I can find that in my log.txt in the GC folder.
I think it is line 12 in the .nc:
G3 X212.497461928934 Y214.63959390862942 I32.121827411167516 J21.829949238578678 F1500
throwing things off.
log->>
Buffer overflow!
Buffer Used: 127
Buffer Number of Lines: 0
Buffer Begin: 87
Buffer End: 86
Buffer Contents: G3 X218.129441624 Y209.979695431 I27.461928934010153 J27.461928G3 X224.002538071 Y206.812182741 I18.39593908629442 J27.06852791(End of Buffer)
<<-
With truncation turned on, it runs smooth.
https://youtu.be/tTb99TDXjsc
Kind regards, Gero

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