Problem with weld surface fan blade

hello ive been trying to make a big fan for a building but and i added a weld and i double checked that the part are touched or not everything seem right but after i tested it
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this happend the two side fan blade just flew away but i already checked and the weld is touched with the fan blade perfectly how do i fix this? or am i just done some step wrong?

Maybe you’re getting that annoying little glitch i had where stuff moves barely a quarter of a stud, enough to be noticeable. Although from the pic i can’t see any gaps.
Try and check the part positions when the fan isn’t diagonal.

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I think its just a glitch i changed fancenter abit so it worked i duplicated and rotate the fan and
weld it with old one instead thanks for helping!!

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No problem! I’m glad i could help! :3

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