display on the piano-roll

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When I'm playing a note on it displays two notes, the one that's extra is higher-pitched, being also the same note but the number is 1 higher, it also while playing the one that's already made sometimes it plays the higher-pitched
First off, Welcome to the Forum Profeta_saru !
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Profeta_saru wrote:
Thu Jul 16, 2020 7:06 pm
When I'm playing a note on it displays two notes, the one that's extra is higher-pitched, being also the same note but the number is 1 higher, it also while playing the one that's already made sometimes it plays the higher-pitched
I think you may have feature on the Chord-Stacking & Arpeggio-tab activated:
Image
Open the tab in the ed square and make sure the two diodes in the blue circles are disabled

If that was not the reason please post your:
* Name of your Operative System (Windows/ Linux/ Mac) And subtype ('Home' 'Mint' '10.13' aso)
* lmms version
* lmms sound device chosen see
https://lmms.io/wiki/index.php?title=LM ... o_Settings

If the issue are with default content:
* lmms instrument involved
* lmms preset (if a factory preset is used)
* Name of FX-plugin if any used
If the issue are with non-default content:
* VST involved & link to a download for this VST
* Name of VST-FX-plugin if any used