Shower drain not flush with pan. Possibly installed wrong?

[keb21]

This drain has bothered me since we purchased our house (2020), but it’s never caused problems or been enough of a nuisance to check it out.
Our shower drain does not sit flush with the lowest point in the pan so we get some pooling water around the edges. It looks to be about 3/16" higher than flush (pictures attached).
While cleaning the shower pan, the silicone that was put around the edge of the flange came clear off so I decided it was time to investigate. Whenever the drain was installed, they used a black rubber gasket underneath the flange on top of the pan, where I believe it’s typically putty or silicone. I believe it might be an Oatey no-caulk drain.

Ideally, I’d like to get the flange to sit lower to stop the pooling, but I don’t necessarily want to call in help since it’s not causing any leaks. Is it possible to remove only the top components of the drain and reinstall it with putty, being sure to tighten it down all the way? Or am I over-simplifying? I don’t want to get into replacing all of the plumbing underneath if it can be avoided.

Other details: This shower is on the second floor of an early 1900s home with a hodge podge of new and old plumbing. There is ceiling access below the shower pan.

I appreciate any advice or insight!

 

[LLigetfa]

My guess is the seal is installed on top rather than below.

 

[Sponsor]

 

[Tuttles Revenge]

The black rubber gasket is supposed to be installed under the pan. The area that it occupies is supposed to be filled with putty or silicone.

 

[keb21]

The black rubber gasket is supposed to be installed under the pan. The area that it occupies is supposed to be filled with putty or silicone.

Thank you for your reply! That’s what I thought. Glancing under the pan, there seems to be another black gasket there but I need to get in there better to look. If that’s the case, can I remove and reinstall the drain from the top only? Or does the whole assembly need to be taken apart, re-assembled, and re-glued to the pipes underneath?

 

[Tuttles Revenge]

I'm not really familiar with that drain, but it looks like it could unscrew from the top. I think the underside is glued to the pipe.

I think I installed that type of drain once back in the early 90s for a very specific application. We (my company) only install brass bodied drains now.

 

[keb21]

I'm not really familiar with that drain, but it looks like it could unscrew from the top. I think the underside is glued to the pipe.

I think I installed that type of drain once back in the early 90s for a very specific application. We (my company) only install brass bodied drains now.

Thank you for your help!