For the different landing pages in the ads, there are two explanations: the first is that the advertiser is split testing different LPs from the same ad, or the second one is that more advertisers are using the same creative but with different LPs.
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AdPlexity detects ads by banners/creatives and puts them together, that's why there can be different landing pages under one banner/creative.

Fullscreen: https://prnt.sc/ow622c