Hmm in that case it could have been that the larger payment had a fee higher than the default limit in your Zeus settings. It would make sense why the smaller payments still worked, as they would have lower fees. 
Discussion
Thanks you corn! nostr:npub1m64hnkh6rs47fd9x6wk2zdtmdj4qkazt734d22d94ery9zzhne5qw9uaks has suggested to raise the limit as well. I think the issue is resolved 🫂
Nice! 💜🤙