The new Smithing Table GUI added experimentally in 23w04a and officially added in 23w12a has its elements aligned to the left, including the armor stand. This is inconsistent, because it is not the case for other containers, which have their GUI aligned to the center.
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In my opinion that bug report doesn't cover this UI because it's new and not yet included in any release. I'm leaving this open but I've marked MC-116465 as related.
Actually not a duplicated bug, since this involves smithing tables and they are not even mentioned in the whole bug report of MC-116465, and also got to mention that the bug you are talking about requires an extensive change of files. Instead, and quoting @slicedlime's comment "— Many of these issues would force resource packs to update if they were fixed. We'll likely revamp the UI at some point in the future, at which point these issues will be addressed." the new smithing table and the whole content of 1.20 is still subject to change (as mentioned in multiple changelogs). And, the killing blow is, that bug report mentions small offsets that aren't enough visible unless you stare at them and measure every pixel of these GUIs, while this, is an inconsistency bug with other GUIs and even the smithing table itself from previous versions.
Dupe of MC-116465