I’m learning texturing and I came across this issue when exporting, how can I fix this?
Are there two meshes overlapping? The other one just hidden from viewport but not from render? And do you mean rendering an image of your scene or exporting the object as a separate file?
Yes I mean rendering, and yes there is a duplicate object I backed up and it’s hidden from the viewport
When exporting, select the object you want to export, and make sure you tick ‘Selection Only’ in the settings when saving.
Ok 
I recommend that you make a separate collection for all the backup meshes etc that you can tap off when you don’t need them visible, that way you don’t accidentally leave them visible for renders. Ofc you could also make all unwanted objects not visible for rendering one by one, either from the camera-shaped icon next to them in the outliner or from the object properties visibility options, but a separate collection is much easier to use if you have many objects, and it’s not so easily forgotten on or off. If you sometimes are not sure what objects you have in your scene still left hidden just tap alt+h to unhide everything.
Thank you so much.