have a read of the many many threads discussing this very common issue … it’s not likely to be a fundamental problem, but rather a problem with approach
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have a good read through all the ideas discussed here, so you can think the problem through yourself
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CV tuning or others …
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Is it V/Oct
Is the octave range of the CV synth broad
Are you playing too high low on A4
Are your cables working as expected (ie separating)
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Try keeping it simple to get a foot in the door
Try C3 > C4 and set a voltage of maybe 2v and 3v
Is it close - does it gate properly
does swapping the cables around make a difference (ie is cable truly TRS to dual mono)
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don’t forget that some synth will transpose if you touch their keyboards during manual CV calibration process described in A4 OS release notes - so if you have a synth which does (like microbrute) it is important to not touch the synth after calibration begins - it must be sounding the same note that you set in A4 - this is an issue for some Moog calibration
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it should be a piece of cake if you’re methodical
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ps: if you provide detail you may be able to get some assistance, it’s all too vague I’m afraid