Stones are hardcapped to your masonry skill when mined, and softcapped by the quality of tool you use second.
loleznub wrote:Quality is softcapped by your tool being used as well as node.
If you mine a q20 stone with a q15 axe, you will end up with q17.5. If you mine a q20 stone and only have 15 masonry, you only get q15.
Make sure your masonry is not being boosted by a realm bonus that you don't get underground. Make sure you have the proper clothes on so you get the masonry bonus you're expecting, and not less. Check your wounds. Some wounds will lower your masonry skill--particularly concussions.
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