If you are at a side shop and you right-click on the steamboots icon in the shop (to purchase all of the components), rather than giving you complete steam boots, it gives you boots + gloves and sticks a +6 str thing in your stash (even though the intelligence thing to complete steam boots is available in the side shop).
Known bug internally, I'll confirm this issue here and use this thread as a reference for the internal report
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Look for my highlighted text (important information) and grey text (interesting but not required information).