Yep that looks like G61 exact stop so try G64 and like Ger says enter Q parameter with value of Zero because Linux CNC seems to have a quirk that it requires it other wise G64 is ignored.! So check code for G61 and replace with G64 Q0 or if G-code doesn't have G61 just enter G64 Q0 in MDI before running the G-code as it's a Modal command so will stay set to G64 until changed by G61.