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This is long standing bug with crop.
In short - Lightroom rounds ratios close enough to standart ratios to them.
I mean 12:7.95 is rounded to 12:8 which is indeed 3:2
If you really want to crop to that aspect you can use AnyCrop plugin: Any Crop Lightroom Plugin
Thanks, the Plugin did the trick. Such a weird bug tho.
Please add your me-too vote and details about why the bug affects you to this bug report: Lightroom: I can't add (certain) custom crop ratios | Photoshop Family Customer Community . That will make it a little more likely Adobe might actually fix the problem. I've provided in that bug report a detailed engineering explanation of how Adobe can fix it, and I provided the plugin as a demonstration of the explanation's correctness, but I don't think Adobe has paid any attention.