Problem with WordPress or???

Hello
I am having troubles with my blogs.
Well they are just new but they run very slow.
or I can’t access them at all.
When I go to wp-admin and enter my log in name and password (and I know 100% that they are both correct), the page start loading, and then I get again the same log in screen with my log in still there but password is blank.
The only way I could log in was to reset a password but I can’t do this everything…
Another thing.. I can’t even open one of my blogs
https://www.lemonlimeonline.com (please ignore a content, I was about to get rid of everything there).
But most importantly is https://www.pilatesworkoutathome.com
I had about 30-40 posts there. Then I changed hosting and tried to move the blog. I thought everything went well, except that I couldn’t log in to wp-admin panel.
I thought it was hosting. So wiped off the whole blog and reinstall WordPress.

I addressed my problem (that I can’t log in into wp-admin panel and that the sites are slow (and pilates blog didn’t want to open at one stage) but they came back and said it is all WordPress problem.
So what should I do?
Why I have to keep resetting my password or why I can’t even get to wp-admin panel at times?
Why the site is so slow or it doesn’t even want to open my page?
I have no plug ins active (I was told it could be a problem with plug ins..)

Thank you very much
Olya

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