Command block coding

I am building in my realms server for the family to play on and I am using command blocks for a build that requires areas to be filled and filled again with air everything seems to be working fine except when I use height level 66! Upon using that history in any code it turns the entire code to #. I have used the same code in other worlds to see if there's a problem but it works just fine in those worlds I am only having a problem in my realms server with that height

 Also note that it’s only in the command block, not if I typed the code in thru chat

im curious if this is a common issue that no one talks about in realms as I wasn't able to find a thread Alrdy containing this, or is it just mine and how do I fix it I've tried everything from reloading the server to remove from realm and replace.