Sidebar Widget | WordPress.org

I have a complicated issue, sidebar doesnt appear, I disabled all the plugins and tested but the sidebar widget doesnt appear

so I thought to use the HTML code, when I use the Custom HTML widget it shows the short code as it is and the slider doesnot appear, but if I used TEXT widget and inserted the short code, the slider appears

Till now it is ok I can use the text widget to insert the Short code

while reactivating the plugins there was a plugin called formidble, when I activate the plugin it stops the TEXT widget and shows the slider on the HTML widget

it is really confusing me I cannot find where the problem or where the conflict is

can you help please, and let me know if you need the admin credentials to check it