My guess is the proper flange was not used as the start of the PVC run. It would have been about 5mm thick 15mm wide with a circumference just inside the inner diameter of the toilet base. Usually it is slotted so a Carriage Bolt can be slipped unto each side thus allowing the pvc with wax ring seal to draw the toilet down to form the air/ water tight seal. You really don't have to know your shit to get this right. haha. But who knows mabey the flange was set flush in the floor or omitted alltogether. Usually there are hints on how to use the ring on the box, just show somchai the pictures.
Speaking of flange I dated a smoking hot girl in my early 20's that was a plumbers apprentice. She wouldn't put out so I dumped her. Same for the gal that's now CPA. The CPAs father ownes a massive tool and die shop that employed many of my friend after high school. Not to mention the gal that went on as a major Jewelry chain founder out of Chicago. She showed up at my sisters 10 year reunion sporting a Lamborghini. Proof positive I was thinking with the wrong head in my youth.
Teach that to your impulsive young sons. No regrets, I'm doing fine now but damn I could be retired by now. Well thats been true for a while regadless. Good luck on the crapper.............fish.
I was thinking this has all the makings of a classic TD thread. Drama, suspense, conjecture and opinion. All you need now are a few more pics,
PS I penned all this while on the crapper. I hope I don't have a heart attack when I stand up or it really will be peace out........the fish.