Why are there so many visitors with time spent on the site less than 10 seconds?

Question

contextual advertising

Good afternoon.
Set up advertising in Yandex direct. Lots of rejections.
I checked the metric, mostly failures from users with an android device.

I looked in the webviewer, they just open the site and immediately close it.

The site was checked for speed, through incognito, he went through his own advertisement, the site opens normally. Requests are relevant.
Tell me please, what could be the problem?

Answer 1

In general, it's probably better to write to Yandex support, ask for a report
And so, offhand, maybe bots?