"Between 6am and 10pm" means from 6am to 10pm. I.e. what the text on the sticker says.
"Between 10pm and 6am" means from 10pm to 6am. I.e. what the blog post mistakingly says.
There is no ambiguity in what "between" means when talking about hours of the clock.
"Between 6am and 10pm" means from 6am to 10pm. I.e. what the text on the sticker says.
"Between 10pm and 6am" means from 10pm to 6am. I.e. what the blog post mistakingly says.
There is no ambiguity in what "between" means when talking about hours of the clock.