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Are the "enable" inputs on the drives wired to something?
Do the motors lock when powering on the machine and stay locked after running LinuxCNC?

If those are step/dir drives, you should be looking here:
forum.linuxcnc.org/10-advanced-configura...glass-scale-feedback
Also
dirsetup and dirhold to 20000
and stepspace and steplen to 5000
Untill you get things working properly, then you can lower the steplen and stepspace while testing to make sure there are no missed steps.
As you have them, chances are some steps are being missed by the drive so LinuxCNC keep upping the number of steps till it catches up.
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Yes, i am aware the drive manual might say 200ns, but that is almost always not correct, except on very good quality drives.

I would set these ini values and re-try:

DIRSETUP = 10000
DIRHOLD = 10000
STEPLEN = 5000
STEPSPACE = 5000

Are these step/dir servos with encoder feedback to LinuxCNC?

If so it seems there is significant delay from command to motion.
This may well be a drive tuning/setup issue. Maybe drive acceleration
set lower than LinuxCNCs setting or some other filtering or constraints
in the drive.