CathInfo.com

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You need to find a library worker who understands how the computers work.
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Not necessarily (and probably not) a librarian -- they know how to find information and books, and how to organize books.
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The computer tech they use might only be there a few hours each week, so ask to find out when he comes in.
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Be sure you are using a computer set aside for adults, not one for children.
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They might have gotten the children's settings mixed up with adult computers, for example.
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Pay close attention when you select or reserve a computer because you might have picked one for children by mistake.
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If you reserved a computer by way of phone call the library rep (probably not a "librarian") may have chosen a child's computer.
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I have had days when CathInfo was not accessible at the library and then came back another day and it was accessible.
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So I don't have all the answers, but I have found that some libraries have strange filters for whatever reason.
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Perhaps they don't want children or even adults playing games online at the library, and since CI has login and allows contributions of text and lets you see other members' contributions, it might look like a gaming site to a system control robot. Only a knowledgeable computer technician would understand that, though.
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Once you find a system tech who can access system settings, you could request that CathInfo be put on a list of EXCEPTIONS whereby you can use it even when the system IDs it as a site that should be blocked. You can show him for example, that there is nothing on CI that ought to be blocked at the Library.
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I'd say that it could be that CathInfo allows free discussion about things Jєωιѕн.