Can’t attach silicone tips to airpod pro

I cannot seem to attach new silicon tips to my airpod pro. When I removed the others there was some white silicone residue, which I removed completely but the new ones don’t seem to fit despite the fact that they came with the original package.

I have watched a few videos and mine are white after the tips are removed whereas in the videos theirs are black? I have definitely removed all the residue. It’s like the tips are just too small?

we only have one set of AirPods in the house so they are the original tips?