Issues with rss requests coming to website after changing from traditional php designed website to wordpress

I had a previous version of my website designed with traditional php web design. Now, I have changed to wordpress tech. and everything is doing fine but one thing killing my website with rss requests(as an example). and my site responds with non-existing page ..
the request is as the following :
an example of the rss request

an example of link request

like shown above all getting non-existing page .. knowing that I have the same Domain !!

and this is the new form of posts in the new wp site :
new link form

and the new form of rss feed link :
new rss feed

should I do something with my old news database ?
Note : it is News website.. and I am not that good in php
thanks in advance !

Source: wordpress

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