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I'm on blender 2.83.5 Today I tried to render my model here, it seems okay with no problems in render viewport

Render Viewport preview

And then weird glitch appears as soon as I press F12 .. I did try to render on both render engines

Render on Cycles Cycles Render - Checker like texture

Render on EEVEE EEVEE render - Snow like texture

So what is the cause of this glitch and how do I solve it? Thank you!

EDIT: the texture is painted manually on Texture Paint workspace. I've already unwrapped all the mesh

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    $\begingroup$ Hello :). Perhaps you have a second copy of your mesh right under it. And if it's set to render only, it doesn't make problems in viewport :). $\endgroup$ – Jachym Michal Aug 25 '20 at 16:53
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    $\begingroup$ Jachym Michal it worked! thank you! $\endgroup$ – hyoura Aug 25 '20 at 16:56
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    $\begingroup$ No problem, this is actually quite a common issue :). Good luck with your project. $\endgroup$ – Jachym Michal Aug 25 '20 at 16:57
  • $\begingroup$ @JachymMichal How did you know? That's like God level luck or highly impressive knowledge. $\endgroup$ – Alex Sandoval Aug 25 '20 at 18:25
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    $\begingroup$ @AlexSandoval You're too kind :). The 'checkered' mesh (called z-fighting) is a typical consequence of overlapping faces :). But 'God level luck' does have a nice ring to it... $\endgroup$ – Jachym Michal Aug 25 '20 at 18:37
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Solved by Jachym Michal, there's a backup collection hidden from viewport, but it was set to appear on render

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Have you UV unwrapped it yet? If not you can go into edit mode and start creating seems where to create your flow and use smart unwrap

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  • $\begingroup$ I already unwrapped it right away after modelling. The texture is a texture painting $\endgroup$ – hyoura Aug 25 '20 at 16:24

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