problem with slash in the link

Hi,
I have wordpress working fine with rss to blog,
recentely I added links into the link pod,
now there is problem,
if i put home url with slash in the end of webpage url there is no problem.
ex: (dog food, https://www.mydogweb.com/

but if I want to have a link to a page then there is problem, ex: (training.html) https://www.mydogweb.com/training.html/ )
usually it should not be a slash after html, but if don’t put the slash when clicked on the particular post on blog the article page shows with lots of html tag for link ( ) no article on it.

on the main page of blog posted articles shows up OK,no matter if i put slash or not.

Now if I put the salsh at the end of page, every thing shows up good when particular article is clicked, but the problem is every link on the article which takes you to page in the website act funny because it has a slash,

when clicked, the page opens but access to links and picture and css file not working properly and as the reslut the page does not look ok,

for example the links which are on that page look like this:

https://www.mydogweb.com/traing.html/anotherpage.html

as you see there is slash after html, how can I solve this problem.

I have not modified the htaccess file and here is the code inside it:
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /blog/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blog/index.php [L]
</IfModule>

# END WordPress

anyone has experiencee same problem, I need help on this,
thanks.