sky130 has the MR (manufacturing rules) deck. You had to pass those rules before submission. Unfortunately, gf180mcu does not have this distinction.
We want to get the number of DRC violations down as much as possible when we submit to the foundry, that's why both the magic and KLayout DRC deck are enabled.
KLayout violations The clock gating cell icgtp_1 is flagged with the following by klayout: CO.6a : (i) Metal1 (< 0.34um) end-of-line overlap contact (Applies to all < 0.34µm wide metal lines,...