Possibly. I can see 10 are getting loaded in the startup logs.
That said, they shouldn't really cause such an issue. Sadly I can't resolve the problem right now so it will have to wait until tomorrow morning - I think I should be able to resolve things then though.
As others have pointed out there is a number of things in the mods that can cause chunks to stay loaded, rather than banning items or trying to hunt down existing items you can simply disable the chunk loading ability of them in the server config files for each of the mods concerned. This at least should mitigate some of the issues the server is experiencing.
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