Sometimes the crown on a mini lop doesn't develop completely preventing the ears from lopping properly. This could be the case here, or possibly mixed I'm no expert haha. That bun is truly adorable though, I love helicopter ears!
I don't know what country you're in - in case you weren't aware, "mini lop" has two different meanings depending on whether you follow the US or British/European naming conventions. The US "mini lop" is a British "dwarf lop", and the British "mini lop" is the US "Holland lop" - it's somewhat confusing when we have two members arguing what they're looking at, and they really mean the same thing, but from two different naming systems.
Seeing him like that he looks fairly pure but his face doesn't look flat enough although his ears are short and wide and definitely look floppy but he could just have too small of a crown. I have a pet bun like that she never lopped properly despite both her parents being purebreds she looks like a cross but isn't.
At his 3 month appt he was about 2 pounds. My guess is that he roughly gained a pound or two. I tried weighing him but he didn't stay on the scale long enough for me to catch the weight. He is 6 months
Scruffles is about 4 pounds. He is 6 months old. The vet set that he is not going to get much bigger. I did my best to get those pictures. However, the back view picture didn't work so well. Scruffles decided picture time was over [