Cool effect, but I see no glitch or anything to fix.
As said before, it is an optical illusion because of the transparency.
It is a matter of perception.
If you look at it as a glass ashtray sitting on a table, then it looks like one.
The largest light blue circle is the bottom of the ashtray and it is always flat on the table.
Note the holder holes stay in the correct position.
They may help you get the right eye on it.
If you want proof then change it to an oval instead of being perfectly round, and show me what that looks like.