SIM switching to second sim automatically while calling at Airtel network

[swapnilnagtilak]

Model Name: Asus Zenfone Max Pro M2
Firmware Version: PKQ1.WW_Phone-16.2017.2007.094-20200705
Rooted or not: Not
Frequency of Occurrence: Always
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When I am calling from 1st sim, only at Airtel network it switch to second sim automatically when 1st sim is set default for calling. 
Dual 4G is enabled and set sim 1 for calling.
Tried restarting phone and switching sim slots but nothing changed. 

In first place had reported to my network provider but they couldn't solve it.

[victor010]

Hi there, we'd request you to share with us a video of the issue so that we can understand it better. Thank you.

[swapnilnagtilak]

victor2020

Hi there, we'd request you to share with us a video of the issue so that we can understand it better. Thank you.

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victor2020
It's simple to understand when I call from first sim it is automatically switching to second sim