I can't describe it with words, so I recorded video.
And I can't even cut them separately.
Can anyone help with it?
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$\begingroup$ Only thing that i can think of is that there has to be double vertex or something similar. If the model is absolutely the same, it would be a bug. Just try select all vertexes and merge by distance, if there will be some merging there were more vertexes in one. $\endgroup$ – Fowl May 22 at 11:04
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$\begingroup$ double vertex or face inside or separated faces? $\endgroup$ – moonboots May 22 at 11:08
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$\begingroup$ There wasn't any double vertex. I tried merge all vertexes by distance and it says me "Removed 0 vertices". $\endgroup$ – ayumi May 22 at 11:14
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$\begingroup$ please share your file: blend-exchange.giantcowfilms.com $\endgroup$ – moonboots May 22 at 11:19
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$\begingroup$ ok I uploaded it. link in the post now $\endgroup$ – ayumi May 22 at 11:23
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So as I said you have inner faces, but there are hidden so you need to unhide and delete. You can't create edge loops if the edge separates more than 2 faces, and by the way those inner faces are not good for your topology, it may create artifacts.
