Corexy strange things moving

cap

hi i wipe out my firmware and reinstalled it added the panel-due still waiting on my ssr to turn up
anyway i have redone my setup got all the axes moving in the right direction and got them all to home correctly

the problem is if i ask x to move any distances the y axes drifts a little and the same vice versa i know it has to be a firmware issue as this never happened before i started fiddling

anyone no where i should start my search

cap

yippee i think i found it
M92 X87.489 Y80 Z400 E420 ; Set steps per mm

cap

yes that was it
now looks like this
M92 X87.489 Y87.489 Z400 E420 ; Set steps per mm

please feel free to delete this post