mesh is way too stretched

[headda]

i upload a mesh and i notice when i scretch the item the back is getting opened and deformed it never happened to me before i made sure all my modilfers on blender applied before exporting i made a beanie and this what happen what did i miss ?

[headda]

problem fixed in blender i had to select everything in edit mode and merge them with M - by distance thanks for someone who explained to me from here!

[Tama Suki]

3 hours ago, headda said:

problem fixed in blender i had to select everything in edit mode and merge them with M - by distance thanks for someone who explained to me from here!

You can also use the remove duplicates function. When building using extrusion or applying the mirror modifier or in any case when rechecking the topology, I use it very often as a habit even if it's not really needed but you know, sometimes having this kind of involuntary twitch is a good thing.

[Aquila Kytori]

10 hours ago, Tama Suki said:

You can also use the remove duplicates function.

Since Blender 2.8 the Remove duplicates Doubles function has been replaced by Merge > By Distance.