Everything is fine with the standard animations. The tool works perfectly. I checked on the original model, now everything is fine. There are no problems with the limbs.
Hehutow
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I have already changed the pose in Blender and yes, it helped. Now the model looks correct, except for one foot. One foot is normal, and the other is raised up. But that's just a matter of fine-tuning the T-pose.
edit: No, everything is correct. Everything works perfectly, the main thing is to set the T-pose properly. My problem with the leg is an addon on the animation; in it, all the models have a crooked foot.

Using a bunch of crutches, I managed to relatively fix the reference model. But the problem still exists — the bones, especially noticeable on the arms. You said to check the names of the bones, their quantity, but everything is fine with that. Especially in A-pose, you can see that my legs, arms, and neck are deformed. I'm definitely doing something wrong.
Could it be a problem that in Blender the rest position is an A-pose, not a T-pose or something like that?

Scale applied. Well, the size is about 75 meters larger than the red standard :) I tried manually reducing it to 0.03 in your tool - then the model is slightly taller than the standard. In that case, the model behaves more reasonably, although it’s still pretty weird. The limbs seem to be longer.
I don't think the problem is with the model. The problem is with my clumsy hands. Since I tried another model, which definitely has no problems. I exported it the same way and opened it in the tool – the result is the same – a 75-meter giant.
I have a problem with importing a model. When I import it, it is partially deformed and 50 times bigger than normal models. I think the problem is in my export of the model to GLTF. I just exported it through Blender. As a result, in GMod I ended up with some kind of creepypasta, where 50-meter-tall white titans with long deformed limbs are standing around the map.
Can you recommend guides for exporting models to GLTF or tell me what I am doing wrong? I am still quite new to Blender, and exporting models to another format is unclear to me.