I saw the same thing last night. I don't know where the source of the bug is (see next posts). Here's an example for Star Trek -- they both have channel number 150:
#EXTINF:0 channel-id="star-trek-1" channel-number="150" tvg-logo="http://images.pluto.tv/channels/5efbd39f8c4ce900075d7698/colorLogoPNG.png" tvc-guide-art="http://images.pluto.tv/channels/5efbd39f8c4ce900075d7698/featuredImage.jpg?fill=blur&fit=fill&fm=jpg&h=562&q=75&w=1000" tvc-guide-title="Star Trek" tvc-guide-description="Boldly go to the channel that brings you Star Trek: The Next Generation, along with the USS Enterprise’s big-screen adventures, all day long." group-title="Entertainment", Star Trek
#EXTINF:0 channel-id="star-trek-2" channel-number="150" tvg-logo="http://images.pluto.tv/channels/5f77879983bec60007e2a196/colorLogoPNG.png" tvc-guide-art="http://images.pluto.tv/channels/5f77879983bec60007e2a196/featuredImage.jpg?fill=blur&fit=fill&fm=jpg&h=562&q=75&w=1000" tvc-guide-title="Star Trek 2" tvc-guide-description="Boldly go to the channel that brings you Star Trek: The Next Generation, along with the USS Enterprise’s big-screen adventures, all day long." group-title="Pluto TV", Star Trek 2
Any of the channels where there's a -1 and -2 channels with the same name has this problem, including Nosey, Love and hip-hop, CSI, and others.
Additionally, in the tvOS app, hangs for about a minute when browsing the guide on the double channels and then the on-screen guide also changes both to the "2" version.