Using CST for stacking PIFA antenna

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Hello all,
I have been using CST for the past few days to design a PIFA antenna with circular patches, circular substrate
I am doing stacking, by : ground plane -substrate 1- lower patch- substrate 2- upper patch- superstrate.
However, I face this issue (see attached). I seriously, don't know which option to choose from and which is the right one for stacking.

Also for shorting pin, I face the shape intersection as it will be between lower patch and ground.. so I click add.. similarly for coaxial feed
Hope that's correct.
Please help.
Thank you.

Hello,
No worries, although both components are made by same material you can choose none.
Regards,
Antx

what about shorting pin? it's between the ground and lower patch
similarly for the feed

i have some issues with stacking. i have different material types. so to layer an antenna if i choose insert then the components are vanishing. then by undo, the shape gets inserted. what should i do. should i again and again insert and undo or choose none. please reply asap.
what if materials are different. i having some issues in this regard.