Title says it all. I haven't a clue why this keeps happening.
(Just FYI; they're Welds, not WeldConstraints.)
I couldn't find anything on the Wiki or Devforum about this odd occurance, so I may as well ask it here in case anyone knows.
COMMUNITY QUESTION
Welds randomly appearing in Parts?
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In Studio or in-game? In Studio, you need to turn off auto-joining to prevent Welds from being created in two parts that touch each other. SurfaceTypes no longer automatically create Welds between parts anymore.
https://devforum.roblox.com/t/part-surface-changes-released/361064
You probably inserted a free model and it's just duplicating welds C:
No free models whatsoever. @BlackOrange3343