I think they're called series in the UK because shows only last a month and a half if they're six episodes long and that's too short to call it a season, but yeah, "series" is just confusing.
"There's a new series on tonight!"
"Really? Is it a new series or an old one?"
"It's a new series, I said that already"
"No, but is it a new series, or a new series?"
"Oh, right, no, it's not a new series. It's just a new series."
"Right. So who's in it then?"
"Nick Knowles."
"I'm not fucking watching that."