Feed rate of extrusion is affecting movement speed of x-y plane

i have a home made 3D printer that im using to print 3D models using paste ( stepper motor and syringe ) so arduino Mega 2560 is being used and i uploaded my marlin (after adjusting my parameters to the desired numbers in configure.h) then upload my design as stl. file to simplify3D (slicer application).
my problem is when i write a number less than 10 in the feed rate section of the extrusion it automatically affect the speed of the x-y plane speed. so is anyone know how to encounter this problem?

The Arduino is doing it!

You wrote the code. Since we can't SEE the code all we can do is guess you have a BUG in your code.
Post code using tags and some sort of schematic - hand drawn ok, THEN we might be able to give something more than "buggy code mon!"

That's fine to avoid gaps in the printout due to insufficient material supply.

Sounds, to me, like a problem with Marlin or the Marlin configuration.

Have you seen the Marlin configuration page?

There is a Marlin forum.

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