2 revive Tags are not working on the same webpage

[programmatic_enthusiast]

Hey team,

I am facing an issue while adding two different tags on the same page. I have created 2 zones under one Website(zone 4 and zone 3)
Tag settings for both the zone are same:

(Tag settings
Don't show the banner again on the same page     NO
Don't show a banner from the same campaign again on the same page     NO)

zone 4 is mapped to Campaign 2 
zone 3 is mapped to Campaign 1

Both the campaigns are under one advertiser and have one 300x250 banner each.

(This banner can be safely displayed inside an iframe (e.g. is not expandable) is unchecked for both the banners)

Below are the web pages where I have added these async tags 
Zone3: https://erailways.in/zone3.html
Zone4: https://erailways.in/zone4.html

The tags are working fine on the above web pages, but when both the tags are placed on the same webpage i.e https://erailways.in/zone34.html
I can see the banner for only that zone which appears first in the webpage code.

I have observed that when "This banner can be safely displayed inside an iframe (e.g. is not expandable) is checked in both the banner", I can see both ads on the same page otherwise I can see only one ad.

What could be the reason here? What measures need to be taken to resolve this?

Thanks a lot, advance! ☺️

Edited September 3, 2018 by programmatic_enthusiast
Invalid demo URL

[andrewatfornax]

Any options like companion positioning enabled?