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This could be "Die Swell" where something that's cold extruded through a nozzle swells in size after it comes out the nozzle. While this is definitely an extreme example it is possible to get 2x expansion.
Check your temps and the temps of the new material.
Edit: are you sure you just haven't bought some 3mm filament as the picture doesn't look extruded, it looks like those are filament off the roll.
They look like they are off the roll because it's from when you load the filament. The top one is 0.6mm and the bottom is 1.2mm and both are from 1.75mm filament trough a 0.4 nozzle at 230.
It could be that the glossy filament expands when it is run too hot? When you print normally with it, it doesn't expand the same way. It's still messier than other filaments when printing details tough.
glossy filament
See my other comment. It will probably print just fine.
wait, what?
You've extruded into air through a 0.4 nozzle and you got 0.6mm worth of die swell?? That seems excessive for any filament type.
What speed did you extrude that at?
There's just no way I could believe you could extrude into thin air through a 0.4 nozzle and end up with 1.2mm worth of swell of any material, unless it was going through an actual chemical reaction.
Something that expands THAT much after extruding would leave a monumental mess.
Ive seen silk filament do this when purged. The pet outer layer formed a sack and the pla inside expanded it. That being said it does look like 3mm filament from the spool.
same, i've had silk pla puff up like a friggin cheeto. thought there was something wrong with it, but it all printed just fine.
In my experience fiber content has a lot to do with this.
Don't worry too much about it. It's all about how you use it!
Thats what she said!