EDITED***I emailed them and this is because they are filled by weight, so each oil may weight less or more resulting in the fill lines to be different. So I am satisfied now***********To me, this is a good sampler for beginners. I was sceptcle to purchase seeing all the broken bottle reviews, but mine luckily were all put together. 100% looked like mine had been returned and then shipped to me. The bottles I got have multiple different fill lines. My picture it’s very hard to see so I added red arrow but over all I get to sample a lot of oils.