Midi instruments go out of tune?

Hello,

This is strange..Im using a midi instrument plugin....if played without recording sounds good then when I record it on a track sounds great....but on playback some of the notes sound flat???...anyone experince this problem? its not my controller on pitch bend....I had this problem with the vst amp of steinberg. Is this a known bug?..used same plug in on cubase 7 no problem dont know what to make of it....this plugin works well in other programs Pro tools, logic pro x....but in cubase pro 9...it goes out..

Any help will be apprecited.

I didn't find the right solution from the Internet.

References:
https://www.steinberg.net/forums/viewtopic.php?t=116475
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Thank you.