G0 ignores Z Max Speed

Hi Guys,

So I just got my first Prusa i3 printer so please help a noob out. I'm running standard marlin firmware ( I think?)

I seem to be having problems with my g0 commands ignoring my z max speed. For example when running the command "G0 F5400 X86.400 Y86.400 Z0.300" the motors slip and the printer doesn't move to the correct position. If I replace the g0 with a g1 then it works perfectly?

Any ideas how I can fix this?
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