Mopub issues - Any advices?

I have an issues with Mopub integration.

I have only one active ad network right now in my Mopub account - one custom network.

However, Mopub sdk is asking for some other banners than a custom network and receives this error:

“No inventory found for adunit…”

at this time we see no ads, but when Mopub asks for custom network banner all is fine and we see banner ads without any delays.

Maybe you have any ideas regarding Mopub settings on website?

I have set the custom network allocation to 100% and it is the only active ad source right now (I have paused all other ad sources), so I’m not sure why Mopub is asking for other ads.

I will appreciate any advice.

Thanks!