First off, WELCOME TO KBOARDS!
And go you! You're in the right place!
I'd say as long as the series are all still "horror" or Share some aspect of genre like that I wouldn't worry about it
OR
as long as the separate series are clearly labeled and you tell people what to expect in the synopsis.
Jim Butcher writes one of my favorite Urban Fantasy series.
He wrote a fantasy series.
I wasn't turned off. But it was very clear that they weren't the same thing.
(Edited for clarity)
And go you! You're in the right place!
I'd say as long as the series are all still "horror" or Share some aspect of genre like that I wouldn't worry about it
OR
as long as the separate series are clearly labeled and you tell people what to expect in the synopsis.
Jim Butcher writes one of my favorite Urban Fantasy series.
He wrote a fantasy series.
I wasn't turned off. But it was very clear that they weren't the same thing.
(Edited for clarity)