thats due to the way the "sec" meters are set up within the configuration table in mfme,
they are set like this
IN sec8 - 1, OUT sec2 - -1
sec3 - 1
sec8 - 1
this is for the accountancy to work correctly in mfme.
if your set up is like a real machine as in takes coins and pays out then maybe you should reset the configuration like this do this via edit mode in mfme (red bar)
click on configuration tab
in sec2 - 1 out sec 3 - 1
If this is wrong i'm sure someone will correct me
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