Only finds every second post in results.

It seems it’s not searching every post or it’s only displaying every second post, I don’t understand it.
like when I search for one post it shows it in results but when I search the next it does not find it, so on and so on.

I’m using the default wp theme so it’s definitely not that interfering with it.

For example, it finds charmed.
but won’t find The Expanse.
it finds Servant.
but won’t find Loki.
ETC

Willsha
Moviethirst.com

Please help.