When I import the character from Maya to

[royal comet]

Looks like some kind of weight painting or rig data is getting messed up when moving to Mixamo.
Are you using a custom rig you made in Maya?
Also are you following any tutorial doing this?

[crude light]

I made the rig in Mixamo and then the skinning I did in Maya, I've been watching tutorials and I also took a course on this last year and I know how to do skinning, in principle I haven't touched anything that I shouldn't have touched

I have tried to delete the non deformer history in maya but it hasn't worked

[royal comet]

Ahh so the rig is something you downloaded / imported from Mixamo and then you created your own mesh on top of it in Maya?

[crude light]

Yea

[royal comet]

And you did the weight painting in Maya?

[crude light]

Yes

[royal comet]

How does everything look in Maya, when it's animated, can you share a video?

[crude light]

I'll send you the video now, one second

[royal comet]

https://helpx.adobe.com/creative-cloud/help/mixamo-rigging-animation.html

Looks like mixamo automatically ties to remap rigged characters onto the mixamo rig by default regardless of if the underlying rig was mixamo to begin with. So I guess somewehre in that automatic mapping it messes the weights.

You could try uploading your character without the rig and go through the rigging process that mixamo offers

or

Given it looks like the weird weights are only an issue on the mixamo side and a kinda small visual thing you could try just downloading some animations from mixamo and importing them to maya, you might need to remap them to your skeleton but seems like it's just something you gotta play around with and see what's the best you can get unfortunately

[crude light]

Mixamo made the rigging work for me automatically. It's strange that this happens to me because it has never happened to me before. I'll have to try what you said. In any case, thank you very much