Go to Object Mode, press Alt+H to unhide any hid objects, press A once or twice to select all objects, press Space, search for "Apply", click on "Apply Object Transform", tick all three options on the bottom-left side of the viewport, press Space and apply object transforms again to make sure all objects have their transforms applied, and then export again.

@Zappy wow that was fast. Thank you so much, will try it soon.

@Zappy Would you be so nice to answer one more question of mine? So I have this texture applied to the arms, and it looks alright in "Textured Mode." But once I render it, the texture is misplaced somehow. Do you have any idea what might be causing it?

No, I don't, but as long as it looks right in Textured mode, it should be fine in Source as well.

引用自 I_AM_NOT_PUNCAKE：

@Zappy Would you be so nice to answer one more question of mine? So I have this texture applied to the arms, and it looks alright in "Textured Mode." But once I render it, the texture is misplaced somehow. Do you have any idea what might be causing it?

Set arms' texture mapping coordinates to UV so it will render properly.

And may I ask you how exaxctly can I do that? What setting should I be looking into?

引用自 xDShot™：

引用自 I_AM_NOT_PUNCAKE：

@Zappy Would you be so nice to answer one more question of mine? So I have this texture applied to the arms, and it looks alright in "Textured Mode." But once I render it, the texture is misplaced somehow. Do you have any idea what might be causing it?

Set arms' texture mapping coordinates to UV so it will render properly.

引用自 Zappy：

Go to Object Mode, press Alt+H to unhide any hid objects, press A once or twice to select all objects, press Space, search for "Apply", click on "Apply Object Transform", tick all three options on the bottom-left side of the viewport, press Space and apply object transforms again to make sure all objects have their transforms applied, and then export again.

Oh yes It's working now. I can't thank you enough!!!