Every link goes to index

hi. i have a wordpress platform on https://umbluliber.com . i am new at this stuff. the blog worked fine until yesterday. here is an example: i want to write a new article which has a picture. the file is at https://umbluliber.com/imagini/articole/fotografie.jpg . if i follow this link, i end up on the index page. any word i put after .com sends me at the index. you can try it:). it works perfectly everytime. what can i do to resolve this problem. i can copy files i need on the blog by ftp…but i cannot put them on the blog because there is no link. the pictures uploaded on server before this problem, work… take a look: https://www.umbluliber.com/imagini/articole/07.11.23.Vita-de-vie-L.jpg .i hope my english isnt too bad for you to understand my problem :). thank you very much for your feedback.